Parasites, Hosts and Diseases

Species identification and pyrethroid resistance genotyping of recently resurgent Cimex lectularius and Cimex hemipterus in Korea: Susie Cho, Heung Chul Kim, Hoonsik Eom, Jae Rok Lee, Chung Hyun Ko, E-hyun Shin, Won Kyu Lee, Si Hyeock Lee, Ju Hyeon Kim; Parasites Hosts Dis 2024;62(2):251-256.
Published online May 27, 2024; DOI: https://doi.org/10.3347/PHD.24002

The global resurgence of bed bug infestations, exacerbated by increasing international travel, trade, and insecticide resistance, has significantly impacted Korea. This study identified the bed bug species and performed pyrethroid resistance genotyping of recently resurgent bed bugs in Korea. Thirty-one regional bed bug samples were collected from 5 administrative regions: Gyeonggi-do (n=14), Seoul (n=13), Busan (n=2), Jeonllanam-do (n=1), and Chungcheongbuk-do (n=1). The samples underwent morphological and molecular identification. Twenty-four regional samples (77.4%) were identified as the tropical bed bug, Cimex hemipterus, and the remaining 7 regional samples (22.6%) were identified as the common bed bug, Cimex lectularius. The C. hemipterus regional samples carried at least three mutations associated with knockdown resistance (kdr), including 2 super-kdr mutations. The 7 C. lectularius regional samples possessed at least one of the 3 kdr-related mutations associated with pyrethroid resistance. This study confirms that the prevalent bed bug species recently in Korea is C. hemipterus, replacing the previously endemic C. lectularius. Additionally, the rise in bed bug populations with pyrethroid resistance underscores the necessity of introducing alternative insecticides.

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Widespread fixation of kdr-associated mutations in temporal samples of Cimex lectularius collected from multi-unit buildings
Jin-Jia Yu, Warren Booth, Changlu Wang
Journal of Pest Science.2026;[Epub] CrossRef
Multiple mechanisms associated with deltamethrin and imidacloprid resistance in field-collected common bed bug, Cimex lectularius L.
Jin-Jia Yu, Shao-Hung Lee, Chow-Yang Lee, Changlu Wang
Pesticide Biochemistry and Physiology.2025; 210: 106357. CrossRef
Global Perspective of Insecticide Resistance in Bed Bugs and Management Options
Chow‐Yang Lee
Entomological Research.2025;[Epub] CrossRef
Molecular identification and knockdown resistance mutation of bed bugs involved in 2019 outbreak in Cape Coast, Ghana and Munich, Germany
Andreas A. Kudom, Philipp Hanke, Joana Ayettey, Rofela Combey, Ben A. Mensah, Benjamin Anderson, Andreas Wieser
Acta Tropica.2025; 265: 107623. CrossRef
Toxicity of ivermectin to bed bugs (Cimex hemipterus) and risk factors associated with infestation in Kwale County, coastal Kenya
Tobias Odongo, Isaiah Omondi, Caroline Wanjiku, Miguel Okoko, Caroline Kiuru, Mercy Kariuki, Isaac Ringera, Bruno Otieno, Festus Mure, Joanna Furnival-Adams, Almudena Sanz Gutierrez, Rachel Otuko, Nelly Regina Rabinovich, Joseph Mwangangi, Carlos Chaccour
Parasites & Vectors.2025;[Epub] CrossRef
Current status of bed bug Cimex lectularius (Hemiptera: Cimicidae) infestation and prevalence of insecticide-resistant amino acid substitutions in Osaka Prefecture, Japan
Maaya Sasaki
Medical Entomology and Zoology.2025; 76(2): 45. CrossRef
Development of molecular diagnostic protocols for simultaneous identification of common bed bugs (Cimex lectularius) and tropical bed bugs (Cimex hemipterus)
Jeong Heum Han, Junhyeong Choi, Susie Cho, Si Hyeock Lee, Ju Hyeon Kim
Parasites & Vectors.2024;[Epub] CrossRef
2023–2024년 국내에서 발생한 빈대의 분포 조사
기훈 김, 선란 조, 희일 이
Public Health Weekly Report.2024; 17(45): 1956. CrossRef

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Prevalence of asymptomatic malaria in high- and low-transmission areas of Tanzania: The role of asymptomatic carriers in malaria persistence and the need for targeted surveillance and control efforts: Ernest Mazigo, Hojong Jun, Wang-Jong Lee, Johnsy Mary Louis, Fadhila Fitriana, Jadidan Hada Syahada, Fauzi Muh, Feng Lu, Md Atique Ahmed, Seok Ho Cha, Wanjoo Chun, Won Sun Park, Se Jin Lee, Sunghun Na, Joon-Hee Han, Nyalali Kija, Smart Geodfrey, Eun-Teak Han, Jim Todd, Alphaxard Manjurano, Winifrida Kidima, Jin-Hee Han; Parasites Hosts Dis 2025;63(1):57-65.
Published online February 25, 2025; DOI: https://doi.org/10.3347/PHD.24077

As many countries implement different programs aimed at eliminating malaria, attention should be given to asymptomatic carriers that may interrupt the progress. This was a community-based cross-sectional study conducted in Tanzania from December 2022 to July 2023 within 4 villages from each of the 3 regions, Geita and Kigoma, which are high malaria transmission, and Arusha, which is low transmission. Malaria was diagnosed in asymptomatic individuals aged 1 year and older using the malaria rapid diagnostic test and light microscope. A total of 2,365 of 3,489 (67.9%) participants were enrolled from high-transmission villages. The overall prevalence was 25.5% and 15.8% by malaria rapid diagnostic test and light microscope, respectively. Using the respective tools, the prevalence was significantly higher at 35.6% (confidence interval (CI)=23.6–49.9) and 23.1% (CI=16.2–35.1) in the high-transmission regions (Geita and Kigoma) compared with 2.9% (CI=1.1–3.5) and 1.1% (CI=0.7–1.8) in the low-transmission region (Arusha). Children younger than 15 years and males accounted for the greatest proportion of infections. In the study area, the prevalence of asymptomatic cases was higher than that of reported symptomatic cases in health facilities. We hypothesize that these parasite reservoirs may contribute to the persistence of malaria in the country. Therefore, to achieve comprehensive malaria control in the country, the surveillance and screening of asymptomatic malaria cases are vital.

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Hidden reservoirs of infection: prevalence and risk factors of asymptomatic malaria in a high-endemic region of Zambia
Wisdom Silwamba, David Chisompola, John Nzobokela, Martin Chakulya, Lombe Kabwe, Kingsley Tembo
Malaria Journal.2025;[Epub] CrossRef
Emergence of chloroquine-sensitive Plasmodium falciparum and rising resistance to first-line artemisinin partner drugs in Malawi
Ernest Mazigo, Hojong Jun, Wang-Jong Lee, Johnsy Mary Louis, Jadidan Hada Syahada, Fadhila Fitriana, Fauzi Muh, Md Atique Ahmed, Feng Lu, Joon-Hee Han, Tae-Hyung Kwon, Se Jin Lee, Sunghun Na, Wanjoo Chun, Won Sun Park, Eun-Taek Han, Winifrida Kidima, Jin-
Emerging Microbes & Infections.2025;[Epub] CrossRef
First report of pfhrp2 and pfhrp3 gene deletions compromising HRP2-based malaria rapid diagnostic tests in Malawi
Johnsy Mary Louis, Ernest Mazigo, Hojong Jun, Wang-Jong Lee, Jadidan Hada Syahada, Fadhila Fitriana, Fauzi Muh, Wanjoo Chun, Won Sun Park, Se Jin Lee, Sunghun Na, Feng Lu, Eun-Teak Han, Jin-Hee Han
Infectious Diseases of Poverty.2025;[Epub] CrossRef
Micro-geographic variation in antigenic diversity of PfEBA-175 region II in asymptomatic Plasmodium falciparum infections in Tanzania
Jadidan Hada Syahada, Wang-Jong Lee, Hojong Jun, Johnsy Mary Louis, Fadhila Fitriana, Fauzi Muh, Feng Lu, Md Atique Ahmed, Sunghun Na, Wanjoo Chun, Won Sun Park, Bo-Young Jeon, Eun-Teak Han, Jim Todd, Alphaxard Manjurano, Winifrida Kidima, Ernest Mazigo,
Frontiers in Immunology.2025;[Epub] CrossRef
Burden and determinants of asymptomatic malaria among adults living in urban and rural areas in Gabon in 2023: a community-based cross-sectional study
Bridy Chesly Moutombi Ditombi, Noé Patrick M’Bondoukwé, Jacques Mari Ndong Ngomo, Helena Noeline Kono, Bedrich Pongui Ngondza, Meredith Ada Mengome, Luccheri Ndong Akomezoghe, Dimitri Ardin Moussavou Mabika, Coella Joyce Mihindou, Reine Moutongo, Denise P
Malaria Journal.2025;[Epub] CrossRef

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Probiotic-induced changes in intestinal microbiome inhibits Toxoplasma gondii infection: Hak-Jae Lee, Do-Won Ham, Seung-Hwan Seo, Guang-Ho Cha, Eun-Hee Shin; Parasites Hosts Dis 2024;62(4):408-423.
Published online November 22, 2024; DOI: https://doi.org/10.3347/PHD.24068

Abstract
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Toxoplasma gondii primarily invades the central nervous system, causing latent infections. Cysts persist in the host for life and there is currently no effective treatment. T. gondii infects human hosts through contaminated meat, invading the intestinal tissue and leading to changes in the number and composition of the gut microbiota. Since probiotic ingestion modulates intestinal microbiota changes, we hypothesized that intestinal microbiota dysbiosis caused by T. gondii infection would be restored following probiotic supplementation. To this end, we orally infected C57BL/6 mice with 10 T. gondii cysts and administered supplemental probiotics daily. We analyzed the levels of T. gondii B1 gene DNA, indicative of T. gondii infection, in brain tissue. We investigated alterations in the gut microbiota composition and functional pathways between the probiotic and non-probiotic treatment groups via next-generation sequencing analysis of each fecal sample. The infection level in the probiotic-treated group was significantly reduced after 4 weeks (p<0.05). Probiotic supplementation notably changed the gut microbiota after 2 weeks of infection, increasing the relative abundance of Intestinimonas massiliensis and Lawsonibacter asaccharolyticus. Probiotic supplements appear to modulate the gut microbiota, activating functional pathways involved in intestinal short-chain fatty acid production and strengthening the intestinal barrier, thereby impeding T. gondii infection and subsequent proliferation. Our findings provide valuable insights into T. gondii infection control and future study directions.

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Lactobacillus vaginalis alleviates DSS induced colitis by regulating the gut microbiota and increasing the production of 3-indoleacrylic acid
Zhuoya Wang, Tian Liu, Li Liu, Jian Xie, Furui Tang, Yimin Pi, Yuchun Zhong, Zhidong He, Wenming Zhang, Cihua Zheng
Pharmacological Research.2025; 213: 107663. CrossRef
Gut microbiota-derived butyrate alleviates the impairment of mice intestinal integrity caused by Toxoplasma gondii infection
Shuni Liu, Yutao Zheng, Bingqian Cui, Jiayi Yang, Bohui Yuan, Yuhan Cao, Zimu Zhao, Zhuo Sun, Qingling Wang, Xiaoying Yang, Wei Pan, Cheng He
Life Sciences.2025; 374: 123709. CrossRef
Analysis of Gut Microbiota and Assessment of Environmental Health in Western Anatolian Vole (Microtus lydius Blackler, 1916)
Tuba Yağcı, Gözde Ayseçkin
Journal of Anatolian Environmental and Animal Sciences.2025; 10(4): 471. CrossRef
Microbiome of Dipteran vectors associated with integron and antibiotic resistance genes in South Korea
Xavier Chavarria, Arwa Shatta, Hyun Seo Park, Du-Yeol Choi, Dongjun Kang, Singeun Oh, Dawon Lee, Myungjun Kim, Jun Ho Choi, Yoon Hee Cho, Myung-hee Yi, Ju Yeong Kim
Acta Tropica.2025; 271: 107858. CrossRef
Urban environmental drivers of eukaryotic microbiota and parasite prevalence in domestic pigeon faeces: a metabarcoding-based public health risk assessment in Seoul, South Korea
Singeun Oh, Jun Ho Choi, Xavier Chavarria, Myungjun Kim, Dongjun Kang, Myung-hee Yi, Yoon Hee Cho, In-Yong Lee, Tai-Soon Yong, Seongjun Choe, Ju Yeong Kim
Journal of The Royal Society Interface.2025;[Epub] CrossRef

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Presence and diversity of free-living amoebae and their potential application as water quality indicators: Areum Choi, Ji Won Seong, Jeong Hyun Kim, Jun Young Lee, Hyun Jae Cho, Shin Ae Kang, Mi Kyung Park, Mi Jin Jeong, Seo Yeong Choi, Yu Jin Jeong, Hak Sun Yu; Parasites Hosts Dis 2024;62(2):180-192.
Published online May 27, 2024; DOI: https://doi.org/10.3347/PHD.24020

Free-living amoebae (FLA) are found in diverse environments, such as soils, rivers, and seas. Hence, they can be used as bioindicators to assess the water quality based solely on their presence. In this study, we determined the presence of FLA in river water by filtering water samples collected from various sites and culturing the resulting filtrates. FLA were detected in all the water samples with varying quality grades (Grades Ι-V). The significant increase in the size of the amoebae population with the deterioration in the water quality. Monoxenic cultures of the amoebae were performed, and genomic DNAs were isolated, among which 18S rDNAs were sequenced to identify the amoeba species. Of the 12 species identified, 10 belonged to the Acanthamoeba genus; of the remaining 2 species, one was identified as Vannella croatica and the other as a species of Vermamoeba. Acanthamoeba was detected in samples with Grades Ι to VI quality, whereas the Vermamoeba species was present only in Grade Ι water. V. croatica was found exclusively in water with Grade ΙΙ quality. Following morphological observations, genomic DNA was sequenced using 16S rDNA to determine whether the species of Acanthamoeba harbored endosymbionts. Most of the isolated Acanthamoeba contained endosymbionts, among which 4 species of endogenous bacteria were identified and examined using transmission electron microscopy. This study provides evidence that the distribution of amoebae other than Acanthamoeba may be associated with water quality. However, further confirmation will be required based on accurate water quality ratings and assessments using a more diverse range of FLA.

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Microbial community structure and pathogen persistence in tropical drinking water distribution systems: the role of seasonality and treatment
Youri Vingataramin, Isaure Quétel, Nina Allouch, Isabel Marcelino
Total Environment Microbiology.2026; 2(1): 100059. CrossRef
Isolation of Acanthamoeba Species and Bacterial Symbiont Variability in Puna Salt Plains, Argentina
Ronnie Mooney, Kiri Rodgers, Sandro Carnicelli, Matías E. Carnevale, Maria Eugenia Farias, Fiona L. Henriquez
Environmental Microbiology Reports.2025;[Epub] CrossRef
Identifying Promising Novel Compounds Against Free-Living Amoebae: A Systematic Review of In Vitro and In Vivo Studies
Beni Jequicene Mussengue Chaúque, Thaisla Cristiane Borella da Silva, Luiza Bernardes Chagas, Letícia F. G. Kinape, Paula Eliete Rodrigues Bitencourt, Custódio José Gaspar, Alexandre Coelho Borges Cheinquer, Marilise Brittes Rott, Régis Adriel Zanette, Jo
Parasitologia.2025; 5(4): 56. CrossRef
The Microbial Trojan Horse and Antimicrobial Resistance: Acanthamoeba as an Environmental Reservoir for Multidrug Resistant Bacteria
Ronnie Mooney, Erin Corbett, Elisa Giammarini, Kiri Rodgers, Carla Donet, Ernest Mui, Arhama T. A. Ansari, Ayush Ransingh, Pradnya S. Vernekar, Harleen K. Walia, Jyoti Sharma, John Connolly, Andrew Hursthouse, Suparna Mukherji, Soumyo Mukherji, Fiona L. H
Environmental Microbiology.2025;[Epub] CrossRef
Le monde fascinant des amibes libres, des protistes aux multiples facettes
Aurélie Delumeau, Nina Allouch, Isaure Quétel, Virginie Nerrière, Isabel Marcelino
médecine/sciences.2025; 41(10): 743. CrossRef

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Organ-specific Toxocara canis larvae migration and host immune response in experimentally infected mice: Min Seok Kim, Yan Jin, Se Joon Woo; Parasites Hosts Dis 2024;62(2):243-250.
Published online May 27, 2024; DOI: https://doi.org/10.3347/PHD.23125

Abstract
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We investigated organ specific Toxocara canis larval migration in mice infected with T. canis larvae. We observed the worm burden and systemic immune responses. Three groups of BALB/c mice (n=5 each) were orally administered 1,000 T. canis 2nd stage larvae to induce larva migrans. Mice were sacrificed at 1, 3, and 5 weeks post-infection. Liver, lung, brain, and eye tissues were collected. Tissue from 2 mice per group was digested for larval count, while the remaining 3 mice underwent histological analysis. Blood hematology and serology were evaluated and compared to that in a control uninfected group (n=5) to assess the immune response. Cytokine levels in bronchoalveolar lavage (BAL) fluid were also analyzed. We found that, 1 week post-infection, the mean parasite load in the liver (72±7.1), brain (31±4.2), lungs (20±5.7), and eyes (2±0) peaked and stayed constant until the 3 weeks. By 5-week post-infection, the worm burden in the liver and lungs significantly decreased to 10±4.2 and 9±5.7, respectively, while they remained relatively stable in the brain and eyes (18±4.2 and 1±0, respectively). Interestingly, ocular larvae resided in all retinal layers, without notable inflammation in outer retina. Mice infected with T. canis exhibited elevated levels of neutrophils, monocytes, eosinophils, and immunoglobulin E. At 5 weeks post-infection, interleukin (IL)-5 and IL-13 levels were elevated in BAL fluid. Whereas IL-4, IL-10, IL-17, and interferon-γ levels in BAL fluid were similar to that in controls. Our findings demonstrate that a small portion of T. canis larvae migrate to the eyes and brain within the first week of infection. Minimal tissue inflammation was observed, probably due to increase of anti-inflammatory cytokines. This study contributes to our understanding of the histological and immunological responses to T. canis infection in mice, which may have implications to further understand human toxocariasis.

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Histopathological changes, dynamics of macrophage polarization and deposition of type I and III collagen along the course of experimental hepatic toxocariasis
Iman F. Abou-El-Naga, Eman Dorry Elkerdany, Rania G. Aly, Enas Mohammed Mostafa Zaytoun
Experimental Parasitology.2026; 280: 109082. CrossRef
Toxocara canis infections in mice: from subtle to severe consequences in 100 weeks
Nicol Bernardová, Jan Novák, Chia-Kwung Fan, Libuše Kolářová, Marta Chanová
Journal of Helminthology.2025;[Epub] CrossRef
The association of seropositivity to Toxocara canis and Ascaris lumbricoides with blood group antigens
Kravchun Pavlo Grigorovich, Leontyeva Frida Solomonivna, Povelichenko Olena Dmytrivna, Kadykova Olga Igorivna, Valentyna Dielievska
Reviews and Research in Medical Microbiology.2025;[Epub] CrossRef
Characteristics of Toxocara canis induced lung inflammation in C57BL/6 mice
Janina Lekki-Jóźwiak, Justyna Karabowicz, Magdalena Paschall, Karolina Gregorczyk-Zboroch, Małgorzata Sobczak-Filipiak, Piotr Bąska, Irma Schabussova, Ewa Długosz
Frontiers in Immunology.2025;[Epub] CrossRef
Immunomodulatory and anti-fibrotic effects of Toxocara canis infection in a murine model of thioacetamide-induced chronic hepatic fibrosis
Iman F. Abou-El-Naga, Eman Dorry Elkerdany, Rania G. Aly, Enas Mohamed Mostafa Zaytoun
Acta Tropica.2025; 272: 107913. CrossRef

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Virus-like particles expressing microneme-associated antigen of Plasmodium berghei confer better protection than those expressing apical membrane antigen 1: Min-Ju Kim, Ki Back Chu, Keon-Woong Yoon, Hae-Ji Kang, Dong-Hun Lee, Eun-Kyung Moon, Fu-Shi Quan; Parasites Hosts Dis 2024;62(2):193-204.
Published online May 27, 2024; DOI: https://doi.org/10.3347/PHD.24017

Malaria is a global disease affecting a large portion of the world’s population. Although vaccines have recently become available, their efficacies are suboptimal. We generated virus-like particles (VLPs) that expressed either apical membrane antigen 1 (AMA1) or microneme-associated antigen (MIC) of Plasmodium berghei and compared their efficacy in BALB/c mice. We found that immune sera acquired from AMA1 VLP- or MIC VLP-immunized mice specifically interacted with the antigen of choice and the whole P. berghei lysate antigen, indicating that the antibodies were highly parasite-specific. Both VLP vaccines significantly enhanced germinal center B cell frequencies in the inguinal lymph nodes of mice compared with the control, but only the mice that received MIC VLPs showed significantly enhanced CD4⁺ T cell responses in the blood following P. berghei challenge infection. AMA1 and MIC VLPs significantly suppressed TNF-α and interleukin-10 production but had a negligible effect on interferon-γ. Both VLPs prevented excessive parasitemia buildup in immunized mice, although parasite burden reduction induced by MIC VLPs was slightly more effective than that induced by AMA1. Both VLPs were equally effective at preventing body weight loss. Our findings demonstrated that the MIC VLP was an effective inducer of protection against murine experimental malaria and should be the focus of further development.

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Orally Dissolving Film-Based Influenza Vaccines Confer Superior Protection Compared to the Oral Administration of Inactivated Influenza Virus
Keon-Woong Yoon, Jie Mao, Gi-Deok Eom, Su In Heo, Ki Back Chu, Mi Suk Lee, Fu-Shi Quan
Vaccines.2025; 13(6): 600. CrossRef
Protective Efficacy Induced by Virus-like Particles Expressing Dense Granule Protein 5 of Toxoplasma gondii
Su In Heo, Hae-Ji Kang, Jie Mao, Zhao-Shou Yang, Md Atique Ahmed, Fu-Shi Quan
Vaccines.2025; 13(8): 787. CrossRef
Efficacy of Heterologous Vaccination Using Virus-Like Particles and Vaccinia Virus Containing MIC8 and AMA1 Proteins of Toxoplasma gondii
Hae-Ji Kang, Fu-Shi Quan
Vaccines.2025; 13(8): 862. CrossRef
Ivermectin Identified Using a High-Throughput Screening System Exhibits Anti-Clonorchis sinensis Activity in Rats
Soon-Ok Lee, Hyeryon Lee, Ki Back Chu, Jianhua Li, Sung-Jong Hong, Sung Soo Kim, Joo Hwan No, Fu-Shi Quan
Antibiotics.2025; 14(8): 837. CrossRef

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Emerging Plasmodium falciparum K13 gene mutation to artemisinin-based combination therapies and partner drugs among malaria-infected population in sub-Saharan Africa: Samuel Adeniyi Oyegbade, Emmanuel Ojochegbe Mameh, Daniel Oluwatobiloba Balogun, Victoria-Grace Onyekachi Aririguzoh, Paul Akinniyi Akinduti; Parasites Hosts Dis 2025;63(2):109-122.
Published online May 26, 2025; DOI: https://doi.org/10.3347/PHD.24053

Abstract
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The continuous Plasmodium falciparum kelch13 (PfK13) genetic alterations conferring resistance to artemisinin-based combination therapies and partner drugs pose a significant threat to effective treatment and control of P. falciparum infection in developing countries. This review evaluates the emergence and epidemiology of the PfK13 mutation associated with artemisinin resistance in the sub-Saharan Africa (SSA) population. Despite empirical control and artemisinin combination therapy, the PfK13 gene mutation, previously described in Southeast Asia, has been reported in the SSA. Eight of these validated markers, including P553L, M476I, C580Y, A675V, P574L, R561H, R622I, and F446I, were reported among the SSA population. Novel and unvalidated markers, such as P615S, M472I, F434S, A578S, P570L, Y558C, K563R, A569T, I684N, M472I, and C473F spread among the population with low frequency. We provide insight into the emergence and spread of validated and unvalidated PfK13 mutations among the SSA population, which could lead to high artemisinin resistance. Investigating the verified PfK13 mutations will improve prophylactic strategies, prognostic diagnosis and guide effective population-based surveillance for effective P. falciparum malaria control in SSA.

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Emergence of chloroquine-sensitive Plasmodium falciparum and rising resistance to first-line artemisinin partner drugs in Malawi
Ernest Mazigo, Hojong Jun, Wang-Jong Lee, Johnsy Mary Louis, Jadidan Hada Syahada, Fadhila Fitriana, Fauzi Muh, Md Atique Ahmed, Feng Lu, Joon-Hee Han, Tae-Hyung Kwon, Se Jin Lee, Sunghun Na, Wanjoo Chun, Won Sun Park, Eun-Taek Han, Winifrida Kidima, Jin-
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Kevin Wamae, John Magudha, Emmanuel Asiimwe, Kariuki Kimani, Regina Kandie, Kibor Keitany, Robert W. Snow, L. Isabella Ochola-Oyier
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Fatoumata Ousmane Maiga, Laurent Dembele, Mohamed Maiga, Abdoulaye A. Djimde
Therapeutic Advances in Infectious Disease.2025;[Epub] CrossRef

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Genotypic analysis of zoonotic Enterocytozoon bieneusi in wild deer in Korea: Gyeonguk Noh, Haeseung Lee, Seung-Hun Lee, Min-Goo Seo, Kyoo-Tae Kim, Junho Lee, Kaifa Nazim, Sang Joon Park, Man Hee Rhee, Dongmi Kwak; Parasites Hosts Dis 2024;62(4):484-489.
Published online November 22, 2024; DOI: https://doi.org/10.3347/PHD.24072

Abstract
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Enterocytozoon bieneusi is an important microsporidian protozoa that causes intestinal disorders in humans. We collected 191 fecal samples from roadkill deer carcasses, among which 13 (6.8%) showed positive reaction for E. bieneusi by polymerase chain reaction assay. Phylogenetic analysis revealed 6 distinct genotypes, 1 of which was novel. All genotypes belonged to Group 1, which has low host specificity, indicating possible transmission through sylvatic cycle. E. bieneusi infection was predominant in female deer (p<0.05).

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Distribution and genotypic analysis of Enterocytozoon bieneusi from cats in Korea
Heon-Moo Park, Haeseung Lee, So-Young Sung, Kaifa Nazim, Bo-Yoon Jang, Ki-Chang Sung, Seung-Hun Lee, Min-Goo Seo, Man Hee Rhee, Dongmi Kwak
Parasites, Hosts and Diseases.2025; 63(2): 188. CrossRef
Molecular Detection and Genotyping of Enterocytozoon bieneusi in Environmental Sources near Cattle Farms in Korea
Haeseung Lee, Myungji Jo, Hyeyeon Kim, Kaifa Nazim, Seung-Hun Lee, Min-Goo Seo, Sang-Joon Park, Man Hee Rhee, Dongmi Kwak
International Journal of Molecular Sciences.2025; 26(15): 7270. CrossRef
Distribution and genotypes of Enterocytozoon bieneusi in raccoon dogs in Korea
Heon-Moo Park, Haeseung Lee, Su-Jin Chae, Kidong Son, Sanghyun Lee, Kaifa Nazim, Seung-Hun Lee, Yoonhoi Koo, Jinsu Kang, Min-Goo Seo, Sang Joon Park, Man Hee Rhee, Dongmi Kwak
Parasites, Hosts and Diseases.2025; 63(3): 258. CrossRef

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Identification of essential genes for Acanthamoeba castellanii excystation during encystation and excystation: Min-Jeong Kim, Hye-Jeong Jo, Fu-Shi Quan, Ki Back Chu, Hyun-Hee Kong, Eun-Kyung Moon; Parasites Hosts Dis 2024;62(4):399-407.
Published online November 22, 2024; DOI: https://doi.org/10.3347/PHD.24062

Acanthamoeba is an opportunistic pathogen that causes Acanthamoeba keratitis, granulomatous amoebic encephalitis, and other cutaneous diseases. The life cycle of Acanthamoeba consists of 2 stages of trophozoites and cysts. Under adverse environmental conditions, Acanthamoeba encysts, while the conditions become favorable for growth, it reverts to the trophozoite form. Acanthamoeba excystation is crucial for its proliferation and can lead to recurrent infections after incomplete treatment. To identify the factors involved in excystation, A. castellanii was subjected to either encystation- or excystation-inducing conditions, and gene expression profiles were compared using mRNA sequencing. A. castellanii samples were collected at 8 h intervals for analysis under both conditions. Differentially expressed gene analysis revealed that 1,214 and 1,163 genes were upregulated and downregulated, respectively, by more than 2-fold during early excystation. Five genes markedly upregulated in early excystation (ACA1_031140, ACA1_032330, ACA1_374400, ACA1_275740, and ACA1_112650) were selected, and their expression levels were confirmed via real-time PCR. Small interfering RNA (siRNA) targeting these 5 genes was transfected into Acanthamoeba and gene knockdown was validated through real-time PCR. The silencing of ACA1_031140, ACA1_032330, ACA1_374400, and ACA1_112650 inhibited excystation and suggested that these genes might be essential for excystation. Our findings provide valuable insights for suppressing Acanthamoeba proliferation and recurrence.

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Integrating molecular pathogenesis and predictive modelling in granulomatous amoebic encephalitis due to Acanthamoeba : a digital twin framework for personalised therapy
Ruqaiyyah Siddiqui, David Lloyd, Naveed Ahmed Khan
Infectious Diseases.2026; 58(1): 164. CrossRef
Encystment and Excystment Processes in Acanthamoeba castellanii: An Emphasis on Cellulose Involvement
Mathew Choaji, Ascel Samba-Louaka, Zineb Fechtali-Moute, Willy Aucher, Sébastien Pomel
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Microarray-based characterization of airway inflammation induced by environmental Acanthamoeba exposure versus the ovalbumin-alum model
Shin Ae Kang, Hak Sun Yu
Parasites, Hosts and Diseases.2025; 63(4): 327. CrossRef

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Current status of intestinal parasite infections in fecal samples of dogs in Korea: You-Jeong Lee, Beoul Kim, Dongmi Kwak, Min-Goo Seo; Parasites Hosts Dis 2024;62(4):438-449.
Published online November 22, 2024; DOI: https://doi.org/10.3347/PHD.24024

Abstract
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This study surveyed the current status of intestinal parasite infections in Korean dog fecal samples. A total of 367 fecal samples were collected from the northern (Seoul and Gyeonggi-do), central (Chungcheong-do), and southern (Gyeongsang-do) regions and analyzed using the saturated sodium nitrate flotation technique and the nucleotide sequences of 18S rRNA. Six species of intestinal parasites were detected using the flotation technique. Among them, helminth eggs detected included Toxocara canis (6.0%), Toxascaris leonina (1.1%), Trichuris vulpis (6.8%), Ancylostoma caninum (2.7%), and Spirometra sp. (1.1%). Additionally, Cystoisospora sp. (7.6%) oocysts were also detected. The prevalence of intestinal parasite infections was higher in shelter dogs than in pet dogs. Molecular genetic assays revealed the gdh and 18S rRNA genes of Giardia duodenalis (type D) in 4.9% of fecal samples. To the best of our knowledge, 18S rRNA genes of Cryptosporidium canis were identified in 1.9% of fecal samples for the first time in Korea. These findings provide an overview of the current status of intestinal parasite infections in fecal samples of dogs from Korea and can be helpful in the surveillance of zoonotic parasite infections related to dogs.

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Prevalence and molecular characterization of intestinal parasites in shelter dogs from South Korea
You-Jeong Lee, Beoul Kim, Gyeonghyeon Lee, Yong-Myung Kang, Dongmi Kwak, Min-Goo Seo
Research in Veterinary Science.2025; 188: 105620. CrossRef
Temporal dynamics of pathogen removal and faecal source tracking in a Norwegian nature-based solution/system treating urban waters
Lisa Paruch, Adam M. Paruch
Environmental Research.2025; 286: 122842. CrossRef
Local field study on the effectiveness and safety of milbemycin oxime and lotilaner (Credelio® Plus) against canine gastrointestinal nematodes in the Republic of Korea
Subin Lee, Jinyeong Park, Chong-Ho Kim, Kyung-Duk Min, Hakhyun Kim, Seung-Hun Lee
Parasitology Research.2025;[Epub] CrossRef

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A novel kit for enrichment of fecal helminth eggs: Eunsol Lee, Seon-Ok Back, Young-Ju Lee, Jung-Won Ju, Hee-Il Lee, Myoung-Ro Lee; Parasites Hosts Dis 2024;62(3):323-329.
Published online August 26, 2024; DOI: https://doi.org/10.3347/PHD.24021

Abstract
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We developed a new concentration kit, called the ParaEgg (PE), for easy detection trematode eggs from fecal samples in endemic areas of clonorchiasis and metagonimiasis in Korea. To create a standard of detection efficiency, 120 fecal samples were examined using the water–ether concentration method (WECM). The PE kit and Mini ParaSep (PS) kit were used to compare the detection sensitivity of 100 egg-positive and 20 egg-negative samples in WECM. Additionally, stool samples, which were intentionally spiked with 10, 20, and 30 Clonorchis sinensis eggs, were evaluated to assess the sensitivity in lowinfection cases. The PE and PS kits showed detection rates of 100% and 92%, respectively, from 100 egg-positive samples in WECM. Meanwhile, eggs were detected in 3 (PE) and 2 (PS) out of 20 egg-negative samples in WECM. The PE kit detected the highest number of eggs per gram of feces (727 on average), followed by the WECM (524) and PS kit (432). In fecal samples that were intentionally spiked with 10, 20, and 30 C. sinensis eggs, PE only detected eggs 2 out of 5 samples in 10 eggs spiked (40%), and the detection rates were 80% and 100%, respectively. The PE kit enabled a more accurate identification of trematode eggs because of the clearance of small fecal debris in the microscopic field. In conclusion, the PE kit is obviously helpful to detect and identify trematode eggs in stool examinations especially in endemic areas of clonorchiasis and metagonimiasis.

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2024년 장내기생충 유행지역 감염 조사

Public Health Weekly Report.2025; 18(19): 707. CrossRef
Diagnostic performance evaluation of ParaEgg for identifying intestinal helminthiasis: A comparative study with conventional copromicroscopy
Tilak Chandra Nath, Heeil Lee, Md. Mahamudul Hasan, Tanmoy Roy Rudro, Dipta Das, Md. Taufiqur Rahman, Nandiny Saha Roy, Pritha Parial, Proloy Chakraborty Tusher, Tarek Siddiki
Parasite Epidemiology and Control.2025; 30: e00449. CrossRef
Detection of intestinal parasites in leopard cat fecal samples using shotgun metagenomics
Jun Ho Choi, Singeun Oh, Myung-hee Yi, Dongjun Kang, Du-Yeol Choi, Xavier Chavarria, Arwa Shatta, Yoon Hee Cho, Seongjun Choe, Seung-Hun Lee, Ju Yeong Kim
Parasites, Hosts and Diseases.2025; 63(4): 349. CrossRef

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Molecular cloning, identification, transcriptional analysis, and silencing of enolase on the life cycle of Haemaphysalis longicornis (Acari, Ixodidae) tick: Md. Samiul Haque, Md. Khalesur Rahman, Mohammad Saiful Islam, Myung-Jo You; Parasites Hosts Dis 2024;62(2):226-237.
Published online May 27, 2024; DOI: https://doi.org/10.3347/PHD.24015

Ticks, blood-sucking ectoparasites, spread diseases to humans and animals. Haemaphysalis longicornis is a significant vector for tick-borne diseases in medical and veterinary contexts. Identifying protective antigens in H. longicornis for an anti-tick vaccine is a key tick control strategy. Enolase, a multifunctional protein, significantly converts D-2-phosphoglycerate and phosphoenolpyruvate in glycolysis and gluconeogenesis in cell cytoplasm. This study cloned a complete open reading frame (ORF) of enolase from the H. longicornis tick and characterized its transcriptional and silencing effect. We amplified the full-length cDNA of the enolase gene using rapid amplification of cDNA ends. The complete cDNA, with an ORF of 1,297 nucleotides, encoded a 432-amino acid polypeptide. Enolase of the Jeju strain H. longicornis exhibited the highest sequence similarity with H. flava (98%), followed by Dermacentor silvarum (82%). The enolase motifs identified included N-terminal and C-terminal regions, magnesium binding sites, and several phosphorylation sites. Reverse transcription-polymerase chain reaction (RT-PCR) analysis indicated that enolase mRNA transcripts were expressed across all developmental stages of ticks and organs such as salivary gland and midgut. RT-PCR showed higher transcript levels in syn-ganglia, suggesting that synganglion nerves influence enolase,s role in tick salivary glands. We injected enolase double-stranded RNA into adult unfed female ticks, after which they were subsequently fed with normal unfed males until they spontaneously dropped off. RNA interference significantly (P<0.05) reduced feeding and reproduction, along with abnormalities in eggs (no embryos) and hatching. These findings suggest enolase is a promising target for future tick control strategies.

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Comprehensive antigen identification and comparative analysis: significant approaches for controlling Haemaphysalis longicornis ticks
Md. Samiul Haque, Bumseok Kim, Myung-Jo You
Journal of Veterinary Science.2025;[Epub] CrossRef
Microbiome Composition of Haemaphysalis flava in Korea and Diversity Analysis Based on Region, Developmental Stage, and Sex
Min Kyu Sang, Jie eun Park, Dae Kwon Song, Jun Yang Jeong, Chan‐Eui Hong, Hyeonjun Shin, Hyeok Lee, Kyoung Won Lee, Hee Ju Hwang, Hyun woo Kim, Seong Yoon Kim, Wook‐Gyo Lee, So Young Park, Se Won Kang, Jung Han Park, Bharat Bhusan Patnaik, Sung‐Jae Cha, S
Entomological Research.2025;[Epub] CrossRef
Identification and knockdown effect of disulfide isomerase in the Haemaphysalis longicornis (Acari: Ixodidae)
Md Samiul Haque, Bumseok Kim, Myung-Jo You
Revista Brasileira de Parasitologia Veterinária.2025;[Epub] CrossRef

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Toxoplasma gondii IST suppresses inflammatory and apoptotic responses by inhibiting STAT1-mediated signaling in IFN-γ/TNF-α-stimulated hepatocytes: Seung-Hwan Seo, Ji-Eun Lee, Do-Won Ham, Eun-Hee Shin; Parasites Hosts Dis 2024;62(1):30-41.
Published online February 23, 2024; DOI: https://doi.org/10.3347/PHD.23129

The dense granule protein of Toxoplasma gondii, inhibitor of signal transducer and activator of transcription 1 (IST) is an inhibitor of signal transducer and activator of transcription 1 (STAT1) transcriptional activity that binds to STAT1 and regulates the expression of inflammatory molecules in host cells. A sterile inflammatory liver injury in pathological acute liver failures occurs when excessive innate immune function, such as the massive release of IFN-γ and TNF-α, is activated without infection. In relation to inflammatory liver injury, we hypothesized that Toxoplasma gondii inhibitor of STAT1 transcription (TgIST) can inhibit the inflammatory response induced by activating the STAT1/IRF-1 mechanism in liver inflammation. This study used IFN-γ and TNF-α as inflammatory inducers at the cellular level of murine hepatocytes (Hepa-1c1c7) to determine whether TgIST inhibits the STAT1/IRF-1 axis. In stable cells transfected with TgIST, STAT1 expression decreased with a decrease in interferon regulatory factor (IRF)-1 levels. Furthermore, STAT1 inhibition of TgIST resulted in lower levels of NF-κB and COX2, as well as significantly lower levels of class II transactivator (CIITA), iNOS, and chemokines (CLXCL9/10/11). TgIST also significantly reduced the expression of hepatocyte proapoptotic markers (Caspase3/8/9, P53, and BAX), which are linked to sterile inflammatory liver injury. TgIST also reduced the expression of adhesion (ICAM-1 and VCAM-1) and infiltration markers of programmed death-ligand 1 (PD-L1) induced by hepatocyte and tissue damage. TgIST restored the cell apoptosis induced by IFN-γ/TNF-α stimulation. These results suggest that TgIST can inhibit STAT1-mediated inflammatory and apoptotic responses in hepatocytes stimulated with proinflammatory cytokines.

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T. gondii CLPTM1 enhances in vivo virulence through activation of the NF-κB/chemokine/macrophage signaling axis
Zhengming He, Di Zhang, Xinru Yue, Min Zhang, Yulian Wei, Junlong Zhao, Rui Fang
Animal Diseases.2026;[Epub] CrossRef
Toxoplasma GRA16 attenuates Tau hyperphosphorylation and enhances autophagy in thrombin-treated HT-22 hippocampal neuronal cells
Seung-Hwan Seo, Do-Won Ham, Ji-Eun Lee, Eun-Hee Shin
Scientific Reports.2025;[Epub] CrossRef
Toxoplasma gondii GRA16 Suppresses Aerobic Glycolysis by Downregulating c-Myc and TERT Expressions in Colorectal Cancer Cells
Ji-Eun Lee, Seung-Hwan Seo, Do-Won Ham, Eun-Hee Shin
Biomolecules & Therapeutics.2025; 33(4): 621. CrossRef

7,183 View
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Molecular detection and characterization of Acanthamoeba infection in dogs and its association with keratitis in Korea: Subin Lee, Badriah Alkathiri, Ji Seung Jung, Nanyoung Kang, Jiyi Hwang, Sang-Eun Park, Yeonchul Hong, Kyung-Mee Park, Seung-Hun Lee; Parasites Hosts Dis 2024;62(1):139-144.
Published online February 23, 2024; DOI: https://doi.org/10.3347/PHD.23112

Abstract
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Acanthamoeba infection is associated with keratitis in humans; however, its association with keratitis in dogs remains unclear. To investigate this possibility, we collected 171 conjunctival swab samples from dogs with eye-related diseases (65 with keratitis and 106 without keratitis) at Chungbuk National University Veterinary Teaching Hospital, Korea, from August 2021 to September 2022. Polymerase chain reaction identified 9 samples (5.3%) as Acanthamoeba positive; of these, 3 were from dogs with keratitis (4.6%) and 6 were from dogs without keratitis (5.7%). Our results indicated no significant association between Acanthamoeba infection and keratitis, season, sex, or age. All Acanthamoeba organisms found in this study had the genotype T4, according to 18S ribosomal RNA analysis. Acanthamoeba infection in dogs might have only a limited association with keratitis.

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Epidemiology, molecular characterization, and risk factors of Acanthamoeba spp., Blastocystis spp., and Cyclospora spp. infections in snakes in China
Yilei Zhang, Zhouchun Li, Xinyuan Wang, Kaili Gao, Lijie Tian, Olalekan Opeyemi Ayanniyi, Qianming Xu, Congshan Yang
Veterinary Parasitology.2025; 335: 110420. CrossRef
Acanthamoeba spp.: Neglected Protists in Veterinary Medicine
Somayeh Bahrami, Mehdi Zarei, Fiona L. Henriquez, Chukwunonso O. Nzelu
Acta Parasitologica.2025;[Epub] CrossRef
Anti-adherent effects of Rhizophora apiculata bark and leaf extracts and computational prediction of the effects of its compound on β-tubulin interaction in Acanthamoeba triangularis genotype 4
Siriphorn Chimplee, Imran Sama-ae, Suthinee Sangkanu, Watcharapong Mitsuwan, Julalak Chuprom, Rachasak Boonhok, Dhrubo Ahmed Khan, Partha Biswas, Md Nazmul Hasan, Hazel Anne Tabo, Cristina C. Salibay, Polrat Wilairatana, Maria L. Pereira, Muhammad Nawaz,
Veterinary World.2024; : 2829. CrossRef

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Molecular detection of Borrelia theileri in cattle in Korea: Hyeon-Ji Hyung, Yun-Sil Choi, Jinho Park, Kwang-Jun Lee, Jun-Gu Kang; Parasites Hosts Dis 2024;62(1):151-156.
Published online February 23, 2024; DOI: https://doi.org/10.3347/PHD.23105

Abstract
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Bovine borreliosis, caused by Borrelia theileri which is transmitted via hard tick bites, is associated with mild clinical symptoms, such as fever, lethargy, hemoglobinuria, anorexia, and anemia. Borrelia theileri infects various animals, such as cattle, deer, horses, goats, sheep, and wild ruminants, in Africa, Australia, and South America. Notably, no case of B. theileri infection has been reported in Korean cattle to date. In this study, 101 blood samples were collected from a Korean indigenous cattle breed, among which 1.98% tested positive for B. theileri via nested PCR. The obtained sequences exhibited high homology with B. theileri strains identified in other regions. Phylogenetic analysis of 16S rRNA confirmed the B. theileri group affiliation; however, flagellin B sequences exhibited divergence, potentially due to regional evolutionary differences. This study provides the first molecular confirmation of B. theileri infection in Korean livestock. Further isolation and nucleotide sequence analyses are necessary to better understand the presence of B. theileri strains in cows in Korea.

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Molecular Investigation of Borrelia Spp. in Small Ruminants and Collected Hard Ticks from Them in Kurdistan Province, Western Iran
Mahsa Farhoodi Moghaddam, Mina Latifian, Meysam Moravedji, Mojdeh Fehri, Maryam Rahravani, Saber Esmaeili
Vector-Borne and Zoonotic Diseases.2026;[Epub] CrossRef
Nationwide Geographical and Temporal Distribution of Tick-Borne Diseases in Korean Water Deer (Hydropotes inermis argyropus)
Beoul Kim, Su-Jin Chae, You-Jeong Lee, Haksub Shin, Sunmin Kwak, Hyesung Jeong, Suwoong Lee, Dongmi Kwak, Min-Goo Seo
Animals.2025; 15(10): 1499. CrossRef
Circulation of tick-borne pathogens in wildlife of the Republic of Korea
Hye-ryung Byun, Seong-Ryeong Ji, Jun-Gu Kang, Chang-Yong Choi, Ki-Jeong Na, Jong-Taek Kim, Joon-Seok Chae
One Health.2024; 19: 100913. CrossRef

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Diversity of midgut microbiota in ticks collected from white-tailed deer (Odocoileus virginianus) from northern Mexico: Zinnia Judith Molina-Garza, Mariana Cuesy-León, Lidia Baylón-Pacheco, José Luis Rosales-Encina, Lucio Galaviz-Silva; Parasites Hosts Dis 2024;62(1):117-130.
Published online February 23, 2024; DOI: https://doi.org/10.3347/PHD.23006

Ticks host different pathogens as endosymbiont and nonpathogenic microorganisms and play an important role in reproductive fitness and nutrient provision. However, the bacterial microbiomes of white-tailed deer ticks have received minimal attention. This study aimed to examine the bacterial microbiome of ticks collected from Odocoileus virginianus on the Mexico–United States border to assess differences in microbiome diversity in ticks of different species, sexes, and localities. Five different tick species were collected: Rhipicephalus microplus, Dermacentor nitens, Otobius megnini, Amblyomma cajennense, and A. maculatum. The tick microbiomes were analyzed using next-generation sequencing. Among all tick species, the most predominant phylum was Proteobacteria, followed by Actinobacteria and Firmicutes. The ticks from Tamaulipas and Nuevo León presented the highest bacterial species diversity. Acinetobacter johnsonii and A. lwoffii were the common bacterial species in the microbiome of all ticks, Coxiella were present in R. microplus, and Dermacentor nitens also exhibited a Francisella-like endosymbiont. The microbiome of most females in D. nitens was less diverse than that of males, whereas R. microplus occurs in females, suggesting that microbiome diversity is influenced by sex. In the bacterial communities of A. maculatum and O. megnini, Candidatus Midichloria massiliensis, and Candidatus Endoecteinascidia fumentensis were the most predominant endosymbionts. These results constitute the initial report on these bacteria, and this is also the first study to characterize the microbiome of O. megnini.

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Gut microbiota landscape of Haemaphysalis longicornis under Borrelia burgdorferi infection
Shibo Lei, Hao Tong, Yaying Zhou, Jing Huang, Xia Zhou, Jianfeng Dai, Zheng Yu
Insect Science.2026;[Epub] CrossRef
Distribution of Rhipicephalus microplus and Hyalomma lusitanicum, and the pathogens they are carrying: A systematic review
Afito Luciano, Binta J.J. Jallow, Mandie Liu, Yuting Ma, Regina Daniel Miambo, Fanming Meng
Parasite Epidemiology and Control.2025; 30: e00437. CrossRef
Nationwide investigation of eukaryotic pathogens in ticks from cattle and sheep in Kyrgyzstan using metabarcoding
Singeun Oh, Nathalie Amvongo-Adjia, Hyun Jung Kim, Jun Ho Choi, Xavier Chavarria, Myung-hee Yi, Arwa Shatta, Bekbolsun Aknazarov, Ju Yeong Kim, Jung-Won Ju, Bekir Oguz
PLOS One.2025; 20(8): e0327953. CrossRef

4,001 View
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Distribution and genotypic analysis of Enterocytozoon bieneusi from cats in Korea: Heon-Moo Park, Haeseung Lee, So-Young Sung, Kaifa Nazim, Bo-Yoon Jang, Ki-Chang Sung, Seung-Hun Lee, Min-Goo Seo, Man Hee Rhee, Dongmi Kwak; Parasites Hosts Dis 2025;63(2):188-194.
Published online May 26, 2025; DOI: https://doi.org/10.3347/PHD.25019

Abstract
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Enterocytozoon bieneusi is an opportunistic microsporidian parasite with zoonotic potential that causes gastrointestinal illness in humans and animals. This study aimed to investigate the presence and genetic diversity of E. bieneusi from cats in Korea and to assess the potential public health risks associated with zoonotic genotypes. Among the 137 feline fecal samples, 4 (2.9%) were PCR-positive for E. bieneusi. In addition, 2 E. bieneusi genotypes were identified: Type IV, a known zoonotic genotype belonging to Group 1, and KCAT1, a novel genotype with zoonotic potential belonging to Group 1. This study is the first to report on these genotypes from cats in Korea, most of which were companion cats visiting veterinary clinics. Despite the low detection rate, the presence of zoonotic genotypes in companion cats is a potential public health concern because of the close physical interaction between cats and their human caregivers. These findings indicate the importance of routine monitoring and the molecular characterization of E. bieneusi in companion animals to comprehensively understand their zoonotic transmission patterns and to guide future risk assessments and preventive strategies.

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Molecular Detection and Genotyping of Enterocytozoon bieneusi in Environmental Sources near Cattle Farms in Korea
Haeseung Lee, Myungji Jo, Hyeyeon Kim, Kaifa Nazim, Seung-Hun Lee, Min-Goo Seo, Sang-Joon Park, Man Hee Rhee, Dongmi Kwak
International Journal of Molecular Sciences.2025; 26(15): 7270. CrossRef
Distribution and genotypes of Enterocytozoon bieneusi in raccoon dogs in Korea
Heon-Moo Park, Haeseung Lee, Su-Jin Chae, Kidong Son, Sanghyun Lee, Kaifa Nazim, Seung-Hun Lee, Yoonhoi Koo, Jinsu Kang, Min-Goo Seo, Sang Joon Park, Man Hee Rhee, Dongmi Kwak
Parasites, Hosts and Diseases.2025; 63(3): 258. CrossRef

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Evaluation of the diagnostic reliability of the gill-based Ray’s fluid thioglycollate medium assay for Perkinsus olseni infections in Manila clams (Ruditapes philippinarum) across Korean tidal flats: Young-Ghan Cho, Kajino Nobuhisa, Hee Jung Choi, Mun-Gyeong Kwon, Hyun-Sung Yang, Kwang-Sik Choi; Parasites Hosts Dis 2025;63(2):157-167.
Published online May 26, 2025; DOI: https://doi.org/10.3347/PHD.25014

The alveolate protozoan parasite Perkinsus olseni infects a range of marine bivalves inhabiting tidal flats and shallow subtidal zones, causing considerable damage to shellfish industries. Infection by P. olseni is typically assessed using Ray’s fluid thioglycollate medium (RFTM) assay, with gill tissue often employed as a diagnostic proxy for whole-body infection. However, the diagnostic reliability of gill-based assays across diverse ecological settings—particularly under low-infection conditions—remains uncertain. In this study, we investigated tissue-specific distribution and the diagnostic performance of the RFTM assay in detecting P. olseni in Manila clams (Ruditapes philippinarum) collected from 6 tidal flats along Korea’s west and south coast. The assay was applied to 6 different tissues, including gills and visceral mass. Infection prevalence reached 100% at most sites, except at Padori (90%). Whole-body infection intensity ranged from 0.1×10⁴ to 3.7×10⁶ cells per gram of tissue. The visceral mass consistently harbored the largest proportion of parasites (27.8%–49.0%), followed by the mantle (17.4%–30.6%) and gills (19.4%–25.2%). Gill infection levels correlated strongly with whole-body infection intensity (r²=0.6–0.95), supporting their diagnostic value in high-infection areas. However, at Padori—where infection levels were lowest—the efficacy of the gill assay dropped to 56%, resulting in a 44% false negative rate. These results underscore the limitations of relying solely on gill tissue in low-infection environments and highlight the need for a context-dependent diagnostic approach. A dual-tissue strategy incorporating both gill and whole-body samples is recommended to improve diagnostic accuracy in P. olseni surveillance of Manila clam populations.

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Transcriptomic Analysis Reveals the Response of the Hong Kong Oyster (Crassostrea hongkongensis) Digestive Gland to Natural Infection by Perkinsus beihaiensis
Shengli Fu, Jie Lu, Tuo Yao, Haoyi Jiang, Yuxiang Wang, Zhifu Liang, Lingtong Ye
Journal of Fish Diseases.2026;[Epub] CrossRef
First report of mass mortality event caused by Eomarteilia granula in Manila clam Ruditapes philippinarum reared in subtidal and bottom cages on the south coast of Korea
Hye-Mi Lee, Hyun-Sil Kang, Nobuhisa Kajino, Hyun-Ki Hong, Young-Ghan Cho, Kwang-Sik Choi
Estuarine, Coastal and Shelf Science.2025; 323: 109408. CrossRef

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Molecular detection of Toxoplasma gondii in ticks and their respective host dogs: Min-Goo Seo, Dongmi Kwak; Parasites Hosts Dis 2025;63(1):66-74.
Published online February 25, 2025; DOI: https://doi.org/10.3347/PHD.24091

Abstract
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We identified the presence of Toxoplasma gondii in ticks and their host dogs, and assess the potential role of ticks as reservoirs for this pathogen. A total of 1,230 feeding ticks were collected from 340 dogs. The tick species identified included Haemaphysalis longicornis, H. flava, and Ixodes nipponensis. Detection of the T. gondii B1 gene occurred in 2 dogs (0.6%) and 4 tick pools (0.9%). Genotyping confirmed the presence of the I/III genotype. This study is the first to report the molecular detection of T. gondii in both canine ticks and their hosts. Our findings offer important insights into the dynamics of T. gondii transmission between vectors and their hosts.

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Detection of intestinal parasites in leopard cat fecal samples using shotgun metagenomics
Jun Ho Choi, Singeun Oh, Myung-hee Yi, Dongjun Kang, Du-Yeol Choi, Xavier Chavarria, Arwa Shatta, Yoon Hee Cho, Seongjun Choe, Seung-Hun Lee, Ju Yeong Kim
Parasites, Hosts and Diseases.2025; 63(4): 349. CrossRef
The first record of an unknown Coccidea Leuckart, 1879 in the midgut of trombiculid larvae Hirsutiella zachvatkini (Acariformes, Trombiculidae)
A.B. Shatrov
Acarina.2025; 33(2): 159. CrossRef

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Anti-tumor effects of Toxoplasma gondii and antigen-pulsed dendritic cells in mice bearing breast cancer: Bong Kyun Kim, Hei Gwon Choi, Jae-Hyung Lee, In Wook Choi, Jae-Min Yuk, Guang-Ho Cha, Young-Ha Lee; Parasites Hosts Dis 2025;63(1):37-49.
Published online February 25, 2025; DOI: https://doi.org/10.3347/PHD.24082

Cancer immunotherapy is widely used to treat various cancers to augment the weakened host immune response against tumors. Dendritic cells (DCs) are specialized antigen-presenting cells that play dual roles in inducing innate and adaptive immunity. Toxoplasma gondii is a protozoan parasite that exhibits anti-tumor activity against certain types of cancers. However, little is known about the anti-tumor effects of T. gondii or tumor/parasite antigen-pulsed DCs (DC vaccines, DCV) in breast cancer. In this study, C57BL/6 mice were administered E0771 mouse breast cancer cells (Cancer-injected) subcutaneously, T. gondii Me49 cysts orally (TG-injected), or DCs pulsed with breast cancer cell lysate antigen and T. gondii lysate antigens (DCV-injected) intraperitoneally. Tumor size and immunological characteristics were subsequently evaluated. We also evaluated matrix metalloproteinase (MMP)-2 and MMP-9 levels in E0771 mouse breast cancer cells co-cultured with T. gondii or DCs by RT-PCR. The tumor volumes of mice injected with breast cancer cells and antigen-pulsed DCs (Cancer/DCV-injected mice) were similar to those of Cancer-injected mice; however, they were significantly reduced in T. gondii-infected tumor-bearing (TG/Cancer-injected) mice. Moreover, tumor volumes were significantly reduced by adding antigen-pulsed DCs (TG/Cancer/DCV-injected mice) compared to TG/Cancer-injected mice. The levels of IFN-γ, serum IgG2a levels, and CD8⁺ T cell populations were significantly higher in DCV- and TG-injected mice than in control mice, while no significant differences between Cancer- and Cancer/DCV-injected mice were observed. The levels of IFN-γ, the IgG2a levels, and the percentage of CD8⁺ T cells were significantly increased in TG/Cancer- and TG/Cancer/DCV-injected mice than in Cancer-injected mice. IFN-γ levels and serum IgG2a levels were further increased in TG/Cancer/DCV-injected mice than in TG/Cancer-injected mice. The MMP-2 and MMP-9 mRNA expressions were significantly decreased in mouse breast cancer cells co-cultured with live T. gondii, T. gondii lysate antigen, or antigen-pulsed DCs (DCV) but not in inactivated DCs. These results indicate that T. gondii induces anti-tumor effects in breast cancer-bearing mice through the induction of strong Th1 immune responses, but not in antigen-pulsed DCs alone. The addition of antigen-pulsed DCs further augments the anti-tumor effects of T. gondii.

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Detection of Toxoplasma gondii and High-Risk Human Papillomaviruses in FFPE Malignant and Benign Breast Lesions Using Real-Time PCR
Selma Usluca, Ayfer Bakir, Ata Arikok, Gizem Korkut, Gulsah Yagiz, Murat Alper
Infection and Drug Resistance.2025; Volume 18: 3149. CrossRef
Parasites’ immunomodulators: a breakthrough in immunotherapeutics displaying antineoplastic activity against human colorectal and hepatocellular carcinoma cells
Nahla El Skhawy, Ahmed Shehata, Maha M. Eissa
Infectious Agents and Cancer.2025;[Epub] CrossRef

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110 Download
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Understanding the pathogenicity of Naegleria fowleri in association with N. fowleri antigen-1 (Nfa1): Jong-Hyun Kim, Hae-Jin Sohn, Ho-Joon Shin, Stacy E. Walz, Suk-Yul Jung; Parasites Hosts Dis 2024;62(4):385-398.
Published online November 22, 2024; DOI: https://doi.org/10.3347/PHD.24025

Abstract
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Naegleria fowleri, a brain-eating amoeba, thrives in lakes and rivers with aquatic vegetation and causes primary amoebic meningoencephalitis (PAM) in humans. Most recently, it has become such a serious problem that N. fowleri was detected in tap water in Houston, USA. Several pathogenic factors are considered very important to destroy target cells in the brain. In particular, the food-cup where N. fowleri antigen-1 (Nfa1) is located, is strongly expressed in pseudopodia involved in the movement of N. fowleri, and is involved in phagocytosis by attaching to target cells. In this article, we reviewed the role of the Nfa1 protein and its associated pathogenicity. The nfa1 gene was cloned by cDNA library immunoscreening using infection serum and immune serum. Nfa1 protein is mainly distributed in pseudopodia important to movement and vacuoles. Moreover, heat shock protein 70, cathepsin-like proteare and Nf-actin are also associated with pseudopodia in which Nfa1 is localized. Interestingly, the amount of the nfa1 gene changed as N. fowleri trophozoites transformed into cysts. Polyclonal antiserum against Nfa1 showed a protective effect against cytotoxicity of approximately 19.7%. Nfa1-specific IgA antibodies prevent N. fowleri trophozoites from adhering to the nasal mucosa, delaying invasion. The nfa1-vaccinated mice showed significantly higher levels of Nfa1-specific antibody. The duration of anti-Nfa1 IgG in the vaccinated mice lasted 12 weeks, strongly suggesting that nfa1 is a significant pathogenic gene and that Nfa1 is a pathogenic protein. Several factors related to pseudopodia and locomotion have been linked to Nfa1. A clearer function of N. fowleri targeting nfa1 with other genes might enable target-based inhibition of N. fowleri pathogenicity.

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Computational exploration of natural inhibitors against toxin-associated proteins in Naegleria fowleri Karachi strain
Rabia Faizan, Muhammad Naveed, Inmaculada Bellido Estevez, Nimra Hanif, Arooj Arshad, Tariq Aziz, Abdulhakeem S. Alamri, Walaa F. Alsanie, Majid Alhomrani
Pathology - Research and Practice.2025; 274: 156184. CrossRef
A review of the mechanism, diagnosis, and treatment of Naegleria fowleri infection
Ling Dai, Xin-Ru Guo, Xu-Rui Chen, Ming-Hao Ma, Zi-Han Liu, Juan Lai, Jun Lu, Ming Feng, Xi-Xia Liu, Sheng-Hui Yang
Frontiers in Microbiology.2025;[Epub] CrossRef

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CysLT receptor-mediated NOX2 activation is required for IL-8 production in HMC-1 cells induced by Trichomonas vaginalis-derived secretory products: Young Ah Lee, Myeong Heon Shin; Parasites Hosts Dis 2024;62(3):270-280.
Published online August 26, 2024; DOI: https://doi.org/10.3347/PHD.24046

Abstract
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Trichomoniasis is caused by a sexually transmitted flagellate protozoan parasite Trichomonas vaginalis. T. vaginalis-derived secretory products (TvSP) contain lipid mediators such as leukotriene B₄ (LTB₄) and various cysteinyl leukotrienes (CysLTs) which included LTC₄, LTD₄, and LTE₄. However, the signaling mechanisms by which T. vaginalis-induced CysLTs stimulate interleukin (IL)-8 production in human mast cells remain unclear. In this study, we investigated these mechanisms in human mast cells (HMC-1). Stimulation with TvSP resulted in increased intracellular reactive oxygen species (ROS) generation and NADPH oxidase 2 (NOX2) activation compared to unstimulated cells. Pre-treatment with NOX2 inhibitors such as diphenyleneiodonium chloride (DPI) or apocynin significantly reduced ROS production in TvSP-stimulated HMC-1 cells. Additionally, TvSP stimulation increased NOX2 protein expression and the translocation of p47^phox from the cytosol to the membrane. Pretreatment of HMC-1 cells with PI3K or PKC inhibitors reduced TvSP-induced p47^phox translocation and ROS generation. Furthermore, NOX2 inhibitors or NOX2 siRNA prevented CREB phosphorylation and IL-8 gene expression or protein secretion induced by TvSP. Pretreatment with a CysLTR antagonist significantly inhibited TvSP-induced ROS production, CREB phosphorylation, and IL-8 production. These results indicate that CysLT-mediated activation of NOX2 plays a crucial role in ROS-dependent IL-8 production in human mast cells stimulated by T. vaginalis-secreted CysLTs. These findings enhance our understanding of the inflammatory response in trichomoniasis and may inform the development of targeted therapies to mitigate this response.

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Radical-induced lipid oxidation produces a torrent of leukotriene-like agonists in severe asthma
Si-Yang Liu, Mikhail Linetsky, Abby Hite, Yu-Shiuan Cheng, Masaru Miyagi, Serena C. Zhu, Hong Zeng, Siqi Huang, Myra Qin, Emma Sintic, Carolyn M. Koutures, Abigail Meneses, Olivia R. Laniak, Sailaja Paruchuri, Lakshminarayan R. Teegala, Kaixi Cui, Fariba
Journal of Allergy and Clinical Immunology.2026; 157(1): 99. CrossRef
Untargeted metabolomics reveals postoperative metabolic dynamics in hepatic cystic echinococcosis patients
Kahaer Tuerxun, Abudouxikuer Abudoumijiti, Zainuer Yusupu, Rousitaimujiang Yimamu, Ronghua Tang, Ziru Wang, Abudoukeyimu Yasheng, Irshat Ibrahim, Yuanquan Wu
Immunobiology.2025; 230(4): 153099. CrossRef

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Population genetic analysis of Plasmodium vivax vir genes in Pakistan: Sylvatrie-Danne Dinzouna-Boutamba, Zin Moon, Sanghyun Lee, Sahib Gul Afridi, Hương Giang Lê, Yeonchul Hong, Byoung-Kuk Na, Youn-Kyoung Goo; Parasites Hosts Dis 2024;62(3):313-322.
Published online August 26, 2024; DOI: https://doi.org/10.3347/PHD.24036

Plasmodium vivax variant interspersed repeats (vir) refer to the key protein used for escaping the host immune system. Knowledge in the genetic variation of vir genes can be used for the development of vaccines or diagnostic methods. Therefore, we evaluated the genetic diversity of the vir genes of P. vivax populations of several Asian countries, including Pakistan, which is a malaria-endemic country experiencing a significant rise in malaria cases in recent years. We analyzed the genetic diversity and population structure of 4 vir genes (vir 4, vir 12, vir 21, and vir 27) in the Pakistan P. vivax population and compared these features to those of the corresponding vir genes in other Asian countries. In Pakistan, vir 4 (S=198, H=9, Hd=0.889, Tajima’s D value=1.12321) was the most genetically heterogenous, while the features of vir 21 (S=8, H=7, Hd=0.664, Tajima’s D value =-0.63763) and vir 27 (S =25, H =11, Hd =0.682, Tajima’s D value=-2.10836) were relatively conserved. Additionally, vir 4 was the most genetically diverse among Asian P. vivax populations, although within population diversity was low. Meanwhile, vir 21 and vir 27 among all Asian populations were closely related genetically. Our findings on the genetic diversity of vir genes and its relationships between populations in diverse geographical locations contribute toward a better understanding of the genetic characteristics of vir. The high level of genetic diversity of vir 4 suggests that this gene can be a useful genetic marker for understanding the P. vivax population structure. Longitudinal genetic diversity studies of vir genes in P. vivax isolates obtained from more diverse geographical areas are needed to better understand the function of vir genes and their use for the development of malaria control measures, such as vaccines.

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Genetic polymorphisms of merozoite surface protein-3α in Plasmodium vivax isolates from Pakistan
Kim Oanh Nguyễn, Jung-Mi Kang, Tuấn Cường Võ, Hương Giang Lê, Seemab Akhtar, Thu Hằng Nguyễn, Đăng Thùy Dương Nguyễn, Minkyoung Cho, Sahib Gul Afridi, Byoung-Kuk Na
Acta Tropica.2025; 272: 107904. CrossRef
Genetic polymorphism of Duffy binding protein in Pakistan Plasmodium vivax isolates
Đăng Thùy Dương Nguyễn, Tuấn Cường Võ, Kim Oanh Nguyễn, Hương Giang Lê, Jung-Mi Kang, Thu Hằng Nguyễn, Minkyoung Cho, Sahib Gul Afridi, Byoung-Kuk Na
Acta Tropica.2024; 260: 107421. CrossRef

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Genetic structure of apical membrane antigen-1 in Plasmodium falciparum isolates from Pakistan: Komal Zaib, Asifullah Khan, Muhammad Umair Khan, Ibrar Ullah, Tuấn Cường Võ, Jung-Mi Kang, Hương Giang Lê, Byoung-Kuk Na, Sahib Gul Afridi; Parasites Hosts Dis 2024;62(3):302-312.
Published online August 26, 2024; DOI: https://doi.org/10.3347/PHD.24028

Plasmodium falciparum apical membrane antigen-1 (PfAMA-1) is a major candidate for the blood-stage malaria vaccine. Genetic polymorphisms of global pfama-1suggest that the genetic diversity of the gene can disturb effective vaccine development targeting this antigen. This study was conducted to explore the genetic diversity and gene structure of pfama-1 among P. falciparum isolates collected in the Khyber Pakhtunkhwa (KP) province of Pakistan. A total of 19 full-length pfama-1 sequences were obtained from KP-Pakistan P. falciparum isolates, and genetic polymorphism and natural selection were investigated. KP-Pakistan pfama-1 exhibited genetic diversity, wherein 58 amino acid changes were identified, most of which were located in ectodomains, and domains I, II, and III. The amino acid changes commonly found in the ectodomain of global pfama-1 were also detected in KP-Pakistan pfama-1. Interestingly, 13 novel amino acid changes not reported in the global population were identified in KP-Pakistan pfama-1. KP-Pakistan pfama-1 shared similar levels of genetic diversity with global pfama-1. Evidence of natural selection and recombination events were also detected in KP-Pakistan pfama-1.

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Genetic diversity and natural selection of cell-traversal protein for ookinetes and sporozoites (CelTOS) in Plasmodium falciparum isolates from Vietnam
Tuấn Cường Võ, Hương Giang Lê, Jung-Mi Kang, Nguyen Thi Minh Trinh, Minkyoung Cho, Youn-Kyoung Goo, Huynh Hong Quang, Byoung-Kuk Na
Gene.2025; 968: 149731. CrossRef
Genetic polymorphism of Duffy binding protein in Pakistan Plasmodium vivax isolates
Đăng Thùy Dương Nguyễn, Tuấn Cường Võ, Kim Oanh Nguyễn, Hương Giang Lê, Jung-Mi Kang, Thu Hằng Nguyễn, Minkyoung Cho, Sahib Gul Afridi, Byoung-Kuk Na
Acta Tropica.2024; 260: 107421. CrossRef

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Proteome identification of common immunological proteins of two nematode parasites: Shin Ae Kang, Hak Sun Yu; Parasites Hosts Dis 2024;62(3):342-350.
Published online August 26, 2024; DOI: https://doi.org/10.3347/PHD.24027

Abstract
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Although helminth parasites have different life cycles, their hosts share similar immune responses involving Th2 cell-type. Here, we extracted proteins from the larvae of Anisakis simplex complex and Trichinella spiralis to identify common and specific antigens (or allergens) associated with the Th2 immune response. We performed two-dimensional electrophoresis analysis and Matrix-assisted laser desorption ionization–time of flight/time of flight (MALDI-TOF/TOF) experiments. We found 13 potentially immunogenic proteins, which included 5 spots specific to T. spiralis and 8 common to T. spiralis and A. simplex, by tandem mass spectrometry. These molecules were identified structurally as actin, tropomyosin, col cuticle N domain-containing protein, and heat shock proteins. We also identified molecules related to parasite-host immune modulation and interactions. Our results may contribute to reveal potential roles of immunological proteins in parasite-derived immune modulation.

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Therapeutic potentials of Trichinella spiralis in immune disorders: From allergy to autoimmunity
Minkyoung Cho, Hak Sun Yu
Parasites, Hosts and Diseases.2025; 63(2): 123. CrossRef
Coupled transcriptome and proteome analysis of L3 and L4 developmental stages of Anisakis simplex s. s.: insights into target genes under glucose influence
Iwona Polak, Robert Stryiński, Mateusz Maździarz, Lukasz Paukszto, Mónica Carrera, Iwona Bogacka, Elżbieta Łopieńska-Biernat
BMC Genomics.2025;[Epub] CrossRef

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Identification of the protease inhibitory domain of Trichinella spiralis novel cystatin (TsCstN): Thassanee Yuthithum, Orawan Phuphisut, Onrapak Reamtong, Nathamon Kosoltanapiwat, Salisa Chaimon, Porntida Kobpornchai, Charin Thawornkuno, Preeyarat Malaithong, Orathai Sawatdichaikul, Poom Adisakwattana; Parasites Hosts Dis 2024;62(3):330-341.
Published online August 26, 2024; DOI: https://doi.org/10.3347/PHD.24026

The Trichinella spiralis novel cystatin (TsCstN) inhibits cathepsin L (CatL) activity and inflammation of macrophages during lipopolysaccharide (LPS) induction. To identify the protease inhibitory region, this study applied an in silico modeling approach to simulate truncation sites of TsCstN (Ts01), which created four truncated forms, including TsCstN^∆1-39 (Ts02), TsCstN^∆1-71 (Ts03), TsCstN^{∆1-20, ∆73-117} (Ts04), and TsCstN^{∆1-20, ∆42-117} (Ts05). The superimposition of these truncates modeled with AlphaFold Colab indicated that their structures were more akin to Ts01 than those modeled with I-TASSER. Moreover, Ts04 exhibited the closest resemblance to the structure of Ts01. The recombinant Ts01 (rTs01) and truncated proteins (rTs02, rTs03, and rTs04) were successfully expressed in a prokaryotic expression system while Ts05 was synthesized, with sizes of approximately 14, 12, 8, 10, and 2.5 kDa, respectively. When determining the inhibition of CatL activity, both rTs01 and rTs04 effectively reduced CatL activity in vitro. Thus, the combination of the α1 and L1 regions may be sufficient to inhibit CatL. This study provides comprehensive insights into TsCstN, particularly regarding its protein function and inhibitory domains against CatL.

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Systems biology of Haemonchus contortus – Advancing biotechnology for parasitic nematode control
Yuanting Zheng, Neil D. Young, Tao Wang, Bill C.H. Chang, Jiangning Song, Robin B. Gasser
Biotechnology Advances.2025; 81: 108567. CrossRef
Therapeutic potentials of Trichinella spiralis in immune disorders: From allergy to autoimmunity
Minkyoung Cho, Hak Sun Yu
Parasites, Hosts and Diseases.2025; 63(2): 123. CrossRef

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Sparganosis in the Indian Sub-continent and the Middle East: Yukifumi Nawa, Mio Tanaka, Masahide Yoshikawa; Parasites Hosts Dis 2024;62(3):263-269.
Published online August 26, 2024; DOI: https://doi.org/10.3347/PHD.23126

Abstract
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Sparganosis is one of the common zoonotic diseases caused by infection with the larval plerocercoids (spargana) of the cestode genus Spirometra. While this parasite distributes globally in canine and feline hosts, human infection is predominantly reported in East Asia, especially China, Korea, Japan, and Thailand. Maybe related to the behavior and food culture, this zoonotic disease is rather rare in South Asia to the Middle East. In these areas, sporadic case reports have been appeared mostly in the local medical journals. To draw a solid picture of sparganosis in these non-endemic areas of Asia, we made an extensive literature survey to gather sparganosis cases in the Indian subcontinent and the Middle East.

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Case report: Sparganosis in Minervarya pierrei (Dubois, 1975) (Amphibia: Anura: Dicroglossidae), a new host from India
Neelanjana Saha, Sudheer Kumar Jena, Oindrila Paul, Suman Das, Upasana Bhattacharya, Anjum N. Rizvi, Pratyush P. Mohapatra
Journal of Parasitic Diseases.2025;[Epub] CrossRef
Deciphering the global genetic structure of Spirometra mansoni and S. erinaceieuropaei based on 28S ribosomal RNA: Insights into taxonomical revaluation and population dynamics
Anil Kumar Nehra, Rasmita Panda, Prem Sagar Maurya, Ansu Kumari, Aman Dev Moudgil
Parasitology Research.2025;[Epub] CrossRef

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The anti-amoebic activity of Pinus densiflora leaf extract against the brain-eating amoeba Naegleria fowleri: Hương Giang Lê, Woong Kim, Jung-Mi Kang, Tuấn Cường Võ, Won Gi Yoo, Hyeonsook Cheong, Byoung-Kuk Na; Parasites Hosts Dis 2024;62(2):169-179.
Published online May 27, 2024; DOI: https://doi.org/10.3347/PHD.23103

Naegleria fowleri invades the brain and causes a fatal primary amoebic meningoencephalitis (PAM). Despite its high mortality rate of approximately 97%, an effective therapeutic drug for PAM has not been developed. Approaches with miltefosine, amphotericin B, and other antimicrobials have been clinically attempted to treat PAM, but their therapeutic efficacy remains unclear. The development of an effective and safe therapeutic drug for PAM is urgently needed. In this study, we investigated the anti-amoebic activity of Pinus densiflora leaf extract (PLE) against N. fowleri. PLE induced significant morphological changes in N. fowleri trophozoites, resulting in the death of the amoeba. The IC50 of PLE on N. fowleri was 62.3±0.95 μg/ml. Alternatively, PLE did not significantly affect the viability of the rat glial cell line C6. Transcriptome analysis revealed differentially expressed genes (DEGs) between PLE-treated and non-treated amoebae. A total of 5,846 DEGs were identified, of which 2,189 were upregulated, and 3,657 were downregulated in the PLE-treated amoebae. The DEGs were categorized into biological process (1,742 genes), cellular component (1,237 genes), and molecular function (846 genes) based on the gene ontology analysis, indicating that PLE may have dramatically altered the biological and cellular functions of the amoeba and contributed to their death. These results suggest that PLE has anti-N. fowleri activity and may be considered as a potential candidate for the development of therapeutic drugs for PAM. It may also be used as a supplement compound to enhance the therapeutic efficacy of drugs currently used to treat PAM.

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A xanthone O-glucoside isolated from Iris setosa Pall. ex Link exhibits promising anti-amoebic activity against the brain-eating amoeba Naegleria fowleri
Hương Giang Lê, Buyng Su Hwang, Ji-Su Choi, Yong Tae Jeong, Tuấn Cường Võ, Minkyoung Cho, Yeonchul Hong, Jeong Ho Kim, Young Taek Oh, Byoung-Kuk Na
Phytomedicine.2025; 147: 157199. CrossRef
From nose to neurons: The lethal journey of the brain-eating amoeba Naegleria fowleri
Arindam Mitra, Débora Brito Goulart
The Microbe.2025; 8: 100537. CrossRef

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Evaluation of the antimalarial activity of SAM13-2HCl with morpholine amide (SKM13 derivative) against antimalarial drug-resistant Plasmodium falciparum and Plasmodium berghei infected ICR mice: Hyelee Hong, Kwonmo Moon, Thuy-Tien Thi Trinh, Tae-Hui Eom, Hyun Park, Hak Sung Kim, Seon-Ju Yeo; Parasites Hosts Dis 2024;62(1):42-52.
Published online February 23, 2024; DOI: https://doi.org/10.3347/PHD.23093

Antimalarial drugs are an urgently need and crucial tool in the campaign against malaria, which can threaten public health. In this study, we examined the cytotoxicity of the 9 antimalarial compounds chemically synthesized using SKM13-2HCl. Except for SKM13-2HCl, the 5 newly synthesized compounds had a 50% cytotoxic concentration (CC₅₀) > 100 µM, indicating that they would be less cytotoxic than SKM13-2HCl. Among the 5 compounds, only SAM13-2HCl outperformed SKM13-2HCl for antimalarial activity, showing a 3- and 1.3-fold greater selective index (SI) (CC₅₀/IC₅₀) than SKM13-2HCl in vitro against both chloroquine-sensitive (3D7) and chloroquine -resistant (K1) Plasmodium falciparum strains, respectively. Thus, the presence of morpholine amide may help to effectively suppress human-infectious P. falciparum parasites. However, the antimalarial activity of SAM13-2HCl was inferior to that of the SKM13-2HCl template compound in the P. berghei NK65-infected mouse model, possibly because SAM13-2HCl had a lower polarity and less efficient pharmacokinetics than SKM13-2HCl. SAM13-2HCl was more toxic in the rodent model. Consequently, SAM13-2HCl containing morpholine was selected from screening a combination of pharmacologically significant structures as being the most effective in vitro against human-infectious P. falciparum but was less efficient in vivo in a P. berghei-infected animal model when compared with SKM13-2HCl. Therefore, SAM13-2HCl containing morpholine could be considered a promising compound to treat chloroquine-resistant P. falciparum infections, although further optimization is crucial to maintain antimalarial activity while reducing toxicity in animals.

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The Importance of Murine Models in Determining In Vivo Pharmacokinetics, Safety, and Efficacy in Antimalarial Drug Discovery
Glory Adebayo, Opeyemi I. Ayanda, Matthias Rottmann, Olusola S. Ajibaye, Gbolahan Oduselu, Julius Mulindwa, Olayinka O. Ajani, Oluwagbemiga Aina, Pascal Mäser, Ezekiel Adebiyi
Pharmaceuticals.2025; 18(3): 424. CrossRef
Structural, electrochemical and theoretical studies of some carboxamides
David Izuchukwu Ugwu, Nandisiwe GS Mateyise, Jeanet Conradie
Journal of Molecular Structure.2025; 1348: 143454. CrossRef

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Latitude and seasons influence the prevalence of Theileria orientalis and affect the hematology of non-grazed dairy cows in Korea: Hector Espiritu, Hee-Woon Lee, Md Shohel Al Faruk, Su-Jeong Jin, Sang-Suk Lee, Yong-Il Cho; Parasites Hosts Dis 2024;62(1):64-74.
Published online February 23, 2024; DOI: https://doi.org/10.3347/PHD.23087

Abstract
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This pilot study aimed to investigate the effects of regional and seasonal variations on the prevalence of Theileria orientalis and the hematological profile of non-grazed dairy cows in Korea. A total of 365 clinically healthy lactating Holstein Friesian cows from 26 dairy farms in 7 provinces that were categorized into northern, central, and southern regions were sampled during the warm period from July to August and the cold period from October to December. The detection of T. orientalis major piroplasm surface protein gene and the hematology non-grazed dairy cows were analyzed using peripheral blood samples. The T. orientalis prevalence was 20.0% (73/365). The prevalence in the southern region was 35.9%, which was significantly higher than that in the central (21.6%) and northern (12.9%) regions (P < 0.05). The prevalence during warm period was higher (43.0%) than that during the cold season (13.5%). The infected cows showed significantly lower erythrocyte counts in the southern region (5.8 ± 0.6 M/µl) and during the warm period (5.8 ± 0.7 M/µl) compared with those in the central and northern regions and during the cold season, which affected the extended RBC parameters, including hematocrit and hemoglobin concentrations. Our findings revealed the prevalence of T. orientalis in Korea, highlighting its high occurrence during warm periods and in certain geographical regions. Climatic factors could contribute to the health and productivity of cattle, as evidenced by the prevalence of T. orientalis and its negative impact on animals.

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Characterization and identification of novel polymorphisms in the OR51H1 gene associated with resistance/tolerance to natural Theileria infection in Vechur (Bos indicus) and crossbred (B. taurus × B. indicus) cattle in a Theileria-endemic region
K. Kalaiyarasi, Muhammed Elayadeth-Meethal
Veterinary Parasitology: Regional Studies and Reports.2025; 60: 101242. CrossRef
Molecular characterization of tick genera Haemaphysalis, Ixodes, and Amblyomma in Korea
Subin Lee, Badriah Alkathiri, Kyu-Sung Ahn, Jiwon Kim, So Youn Youn, Mi-Sun Yoo, Hyang-Sim Lee, Jae-Myung Kim, Dongmi Kwak, Sung Shik Shin, Seung-Hun Lee
Parasites, Hosts and Diseases.2025; 63(3): 272. CrossRef

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Vaccinia virus expressing MIC8 and AMA1 provides protection against Toxoplasma gondii ME49 infection: Hae-Ji Kang, Yan Jin, Zhao-Shou Yang, Md Atique Ahmed, Fu-Shi Quan; Parasites Hosts Dis 2025;63(4):340-348.
Published online November 19, 2025; DOI: https://doi.org/10.3347/PHD.25054

Abstract
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Toxoplasma gondii is an intracellular protozoan parasite capable of causing chronic infection by forming persistent cysts in the brain. Despite its global burden, no approved vaccine exists. Virus-like particle vaccines expressing microneme protein 8 (MIC8) or apical membrane antigen 1 (AMA1) of T. gondii have previously shown efficacy. In this study, we generated recombinant vaccinia viruses (rVVs) expressing MIC8 and AMA1 and evaluated their efficacy against T. gondii ME49 infection. BALB/c mice were intramuscularly immunized with a combination of MIC8 and AMA1 rVVs and challenged orally with T. gondii ME49. Immunization with MIC8+AMA1 rVVs produced a significant increase in T. gondii-specific IgG. Splenocyte analysis revealed robust activation of CD4⁺ and CD8⁺ T cells, as well as expansion of memory B cells. The immunized group exhibited an 89.6% reduction in brain cyst count, with significantly improved survival compared to the control group. These findings demonstrate that combining the antigens MIC8 and AMA1 using a vaccinia virus platform can effectively promote both humoral and cellular immunity, supporting its potential as a vaccine strategy against T. gondii ME49.

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Protection Against Toxoplasma gondii Lethal ME49 Challenge Induced by Influenza Virus-like Particles Containing Dense Granule Protein 14
Jie Mao, Hae-Ji Kang, Gi-Deok Eom, Su In Heo, Hynnu Nam, Ji-Hyun Lee, Ki-Ho Park, Mi Suk Lee, Sung Soo Kim, Fu-Shi Quan
Pharmaceutics.2026; 18(1): 93. CrossRef

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Identification of an Opisthorchis viverrini-like liver fluke from Myanmar: Metacercariae recovered from snakehead fish and adults from an experimentally infected hamster: Woon-Mok Sohn, Bong-Kwang Jung, Keon-Hoon Lee, Sung-Jong Hong, Seung-Hwan Seo, Thi Thi Htoon, Htay Htay Tin, Eun-Hee Shin, Jong-Yil Chai; Parasites Hosts Dis 2025;63(2):174-181.
Published online May 26, 2025; DOI: https://doi.org/10.3347/PHD.24063

A novel fluke species, morphologically resembling Opisthorchis viverrini, was discovered in the Yangon Region, Myanmar. Metacercariae were found in the muscle tissue of 2 snakehead fish species, Mi and Channa striata. The metacercariae were elliptical (average 165×122 μm, n=10), having 2 suckers and a large excretory bladder. Experimental infection of a hamster resulted in the recovery of adult flukes from the bile ducts at day 50 post-infection. Adult flukes were lanceolate, with dimensions of 3.8–6.0 (average 5.1) mm by 1.1–1.2 (1.2) mm (n=10). Morphological characteristics included an oral sucker slightly smaller than the ventral sucker, a long uterus not extending anterior to the ventral sucker, vitelline follicles reaching the anterior ovary level, and 2 deeply lobed testes (4 lobes anteriorly, 5 posteriorly). Eggs were ovoid to elliptical, measuring 26.3–27.5 (26.9) μm in length and 13.8–15.0 (14.6) μm in width (n=10). Despite the close morphological resemblance to O. viverrini, our specimens displayed significant differences, including a more spiraled seminal vesicle, a longer uterus occupying 50%–60% of the body length, a less distinct grouping of vitelline follicles (forming 7–8 groups on each side in O. viverrini), vitelline follicles restricted to the ovary level (beyond the posterior end of the ovary or at anterior testis level in O. viverrini), and smaller metacercariae. We tentatively categorize our specimens as an O. viverrini-like liver fluke potentially parasitizing mammals or birds, highlighting the need for further research. Rigorous molecular analyses and identification of natural definitive hosts are essential to clarify the taxonomic status of this novel parasite.

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Toward resolving cryptic diversity in opisthorchiid flukes: Molecular clarification of an Opisthorchis viverrini-like parasite in Myanmar is urgently needed
Schawanya Kaewpitoon Rattanapitoon, Chutharat Thanchonnang, Nathkapach Kaewpitoon Rattanapitoon
Parasites, Hosts and Diseases.2025; 63(3): 284. CrossRef

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Prevalence of parasitic infections in stray cats from Gimpo-si, Gyeonggi-do, Korea: Sooji Hong, Hyejoo Shin, Seungwan Ryoo, Chung-Won Lee, Jae-Young Park, Jong-Yil Chai, Bong-Kwang Jung; Parasites Hosts Dis 2025;63(2):182-187.
Published online May 26, 2025; DOI: https://doi.org/10.3347/PHD.24061

Stray cats serve as reservoir hosts for various zoonotic parasites, posing a significant risk of transmission to humans. This study aimed to assess the prevalence of parasitic infections in stray cats from Gimpo-si, Gyeonggi-do, Korea. A total of 101 fecal and 237 blood (serum) samples were collected from 237 stray cats captured through the trapneuter-return program in 2021. The samples were analyzed using microscopy, nested-PCR, and ELISA to detect parasitic infections. Fecal examination revealed that Toxocara cati eggs were present in 26.7% (27/101) of samples, while eggs of Spirometra sp. (2%), Clonorchis sinensis (1%), and Trichuris sp. (1%) were also detected. PCR analysis identified Toxoplasma gondii DNA in 17 (16.8%) fecal samples, while genetic markers of Cryptosporidium felis and Enterocytozoon bieneusi were each detected in 4 (4%) samples. Positive rates of IgM and IgG were 21.9% (52/237) and 21.1% (50/237) in serological tests for T. gondii-specific antibodies. This study confirms the widespread presence of zoonotic parasites in stray cats from Gimpo-si, highlighting the potential public health risks associated with these infections. Continuous surveillance and control measures are essential from a One Health perspective to reduce the risk of zoonotic transmission.

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Molecular detection of Toxoplasma gondii in wild oysters and seawater on the southeast coast of South Korea
Hyejoo Shin, Sooji Hong, Seungwan Ryoo, Jong-Yil Chai, Bong-Kwang Jung
Food Microbiology.2026; 134: 104925. CrossRef

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Anticoccidial activities of a multicomplex mineral-based diet in broilers infected with Eimeria acervulina: Binh T. Nguyen, Rochelle A. Flores, Paula Leona T. Cammayo-Fletcher, Suk Kim, Woo H. Kim, Wongi Min; Parasites Hosts Dis 2025;63(2):135-146.
Published online May 26, 2025; DOI: https://doi.org/10.3347/PHD.24045

Poultry coccidiosis, caused by 7 Eimeria species, has a significant economic impact on the poultry industry and is managed mainly by chemotherapeutic drugs. However, alternative control measures are needed due to the emergence of drug-resistant strains. This study aimed to evaluate the anticoccidial effects of a multicomplex mineral-based diet in broilers infected with Eimeria acervulina. Broilers were fed a multicomplex mineral-based diet and infected with E. acervulina. Fecal oocyst shedding was 39.0% lower in the E. acervulina-infected broilers treated with the multicomplex mineral compared to that in untreated-infected broilers (365.7×10⁶±45.7 versus 599.8×10⁶±8.7, P<0.05). On day 6 post-infection, body weight gain was significantly higher in treated-infected chickens than untreated chickens (103.2±1.5% versus 94.1±1.7%, P<0.001). The lesion scores were similar between the 2 groups. Histopathological observations revealed that the width of the villi in the treated-infected chickens (286±9.5 μm) was significantly increased by 19.1% (240±10.8 μm, P<0.05) and 34.9% (212±7.3 μm, P<0.001) compared to those in the untreated-uninfected and untreated-infected groups, respectively. However, the villous height and crypt depth were similar between the untreated- and treated-infected groups. The positive effects of the dietary multicomplex mineral, including reduced fecal oocyst shedding, increased weight gain, and increased villi width, suggest its potential application in mitigating the adverse effects of Eimeria infection in both conventional and organic chicken industries.

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Urban environmental drivers of eukaryotic microbiota and parasite prevalence in domestic pigeon faeces: a metabarcoding-based public health risk assessment in Seoul, South Korea
Singeun Oh, Jun Ho Choi, Xavier Chavarria, Myungjun Kim, Dongjun Kang, Myung-hee Yi, Yoon Hee Cho, In-Yong Lee, Tai-Soon Yong, Seongjun Choe, Ju Yeong Kim
Journal of The Royal Society Interface.2025;[Epub] CrossRef

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Thelazia callipaeda (Nematoda: Spirurida) infections in 2 wildlife species, Prionailurus bengalensis and Nyctereutes procyonoides, in Korea: Jinho Jang, Young-Seok Park, YoungMin Yun, Keeseon S. Eom, Seongjun Choe; Parasites Hosts Dis 2025;63(1):95-101.
Published online February 25, 2025; DOI: https://doi.org/10.3347/PHD.24079

Abstract
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Thelazia callipaeda (Spirurida, Thelaziidae), a parasitic eye worm causing thelaziasis has been reported in humans and dogs in Korea. However, its occurrence in other potential reservoir hosts, including wild animals, remains unclear. In the present study, we described the 2 cases of thelaziasis from both of feral and captive wild animal in Korea. In August and November 2017, 2 cases of the parasitic infections were found in the third eyelid of rescued leopard cat Prionailurus bengalensis and reared raccoon dog Nyctereutes procyonoides at the Chungnam Wild Animal Rescue Center. A total of 20 and 24 worms were detected from the left and right eyes of leopard cat, respectively. In the left eye of the raccoon dog, 5 worms were recognized. Male worms were 969–11,860 μm long (10,600 μm on average) and 300–320 μm width (315 μm on average). Female worms were 13,430–15,330 (14,480) μm long and 320–370 (344) μm wide in size. They commonly had a characteristic scalariform buccal cavity and short esophagus. The vulva openings were located at the anterior of esophago-intestinal junction in females. The thelaziasis is reported in 2 species of wildlife, P. bengalensis and N. procyonoides, for the first time in Korea.

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Detection of intestinal parasites in leopard cat fecal samples using shotgun metagenomics
Jun Ho Choi, Singeun Oh, Myung-hee Yi, Dongjun Kang, Du-Yeol Choi, Xavier Chavarria, Arwa Shatta, Yoon Hee Cho, Seongjun Choe, Seung-Hun Lee, Ju Yeong Kim
Parasites, Hosts and Diseases.2025; 63(4): 349. CrossRef

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Impact of self-efficacy–based health education programs on behavior modification for Opisthorchis viverrini and cholangiocarcinoma prevention in Thailand: A systematic review and meta-analysis: Worathon Busabong, Somkiattiyos Woradet, Nopparat Songserm; Parasites Hosts Dis 2025;63(1):1-11.
Published online February 25, 2025; DOI: https://doi.org/10.3347/PHD.24074

Abstract
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Opisthorchis viverrini (OV) infection, which can progress to cholangiocarcinoma (CCA), poses a critical public health challenge. While numerous studies have investigated behavior modification programs aimed at preventing OV and CCA, the effectiveness of these interventions remains inconclusive. This systematic review and meta-analysis sought to synthesize evidence on the efficacy of behavior modification programs, particularly those based on self-efficacy, in preventing OV and CCA. We reviewed experimental and quasi-experimental studies, comprising 2-group comparisons or 1-group pretest-posttest designs, that evaluated health education interventions focused on behavior modification for OV and CCA prevention. Relevant literatures was systematically retrieved from the PubMed, Google Scholar, ThaiJo, and ThaiLis databases. Of 702 identified studies, 13 met the systematic review and meta-analysis inclusion criteria. The analysis assessed the quality of the studies, extracted data, and evaluated the risk of bias. Standardized mean differences were calculated to determine the impact of self-efficacy– based programs on knowledge, self-efficacy, and behavior modification. The results indicated significant post-intervention improvements in all outcomes (P<0.001) despite high heterogeneity in knowledge (I²=76%), self-efficacy (I²=77%), and behavior modification (I²=93%). The experimental group demonstrated significantly more significant improvements in knowledge (mean difference=1.52, 95% confidence interval (CI)=1.36–1.68), self-efficacy (mean difference=1.08, 95% CI=0.90–1.26), and behavior modification (mean difference=1.78, 95% CI=1.63–1.92) compared to the comparison group, with I² values of 74%, 84%, and 92%, respectively. In conclusion, health education programs grounded in self-efficacy principles effectively enhance knowledge, selfefficacy, and behavior modification to prevent OV and CCA. These findings suggest that self-efficacy–based behavior modification programs may also apply to the prevention of other diseases.

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Re: Impact of self-efficacy–based health education programs on behavior modification for Opisthorchis viverrini and cholangiocarcinoma prevention in Thailand: A systematic review and meta-analysis
Nathkapach Kaewpitoon Rattanapitoon, Chutharat Thanchonnang, Schawanya Kaewpitoon Rattanapitoon
Parasites, Hosts and Diseases.2025; 63(4): 378. CrossRef

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Giardia intraflagellar transport protein 88 is involved in flagella formation: Hye Rim Yeo, Mee Young Shin, Juri Kim, Soon-Jung Park; Parasites Hosts Dis 2025;63(1):12-24.
Published online February 25, 2025; DOI: https://doi.org/10.3347/PHD.24064

Intraflagellar transport (IFT) particles, a multi-protein apparatus composed of complex A and B, are known to be involved in homeostasis of flagella formation. IFT particles have recently become an interesting topic in Giardia lamblia, which has 4 pairs of flagella. In this experiment, we examined the function of giardial IFT components. When 7 components (IFT121, 140, 20, 46, 52, 81, and 88) of IFT were expressed in Giardia trophozoites as a tagged form with mNeonGreen, all of them were found in both flagella pores and cytoplasmic axonemes. In addition, motor proteins for IFT particles (kinesin-13 and kinesin-2b), were localized to a median body and cytoplasmic flagella, respectively. The CRISPRi-mediated knockdown of IFT88 significantly affected the lengths of all 4 flagella compared to the control cells, Giardia expressing dead Cas9 using control guide RNA. Decreased expression of kinesin-2b also resulted in shortening of flagella, excluding the ventral flagella. Live Giardia cells expressing IFT88-mNeonGreen clearly demonstrated fluorescence in flagella pores and cytoplasmic axonemes. These results on IFT88 and kinesin-2b indicate that IFT complex plays a role in maintenance of G. lamblia flagella.

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Identification and confirmation of SUMOylation-modified proteins in Giardia trophozoites
Hye Rim Yeo, Mee Young Shin, Juri Kim, Soon-Jung Park
Parasites, Hosts and Diseases.2025; 63(3): 264. CrossRef

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An integrated mass drug administration against hymenolepiasis and schistosomiasis in Sudan: Yan Jin; Parasites Hosts Dis 2025;63(1):87-94.
Published online February 25, 2025; DOI: https://doi.org/10.3347/PHD.24056

Hymenolepis nana, commonly known as the dwarf tapeworm, affects 50 to 75 million people worldwide. To date, no studies have explored the disease burden of H. nana infection in Sudan. This study aimed to determine the national prevalence of H. nana across 189 districts and 18 states in Sudan and the number of individuals infected with H. nana who did not receive treatment during the mass drug administration (MDA) campaign targeting schistosomiasis. In addition, the study sought to evaluate the extent of co-infection of H. nana with schistosomiasis and soil-transmitted helminthiasis. This involved a secondary analysis of a nationwide survey conducted in 2017 in Sudan. Binomial family generalized linear models with a logarithmic link function were used to estimate the prevalence ratio of potential risk factors, including sex and water and sanitation conditions in schools and households. For the nationwide survey, a 2-stage sampling method was used, in which 105,167 students were selected from 1,772 schools. A total of 96,679 stool samples were collected, of which 4,706 (4.9%) tested positive for H. nana. Of these, fewer than 1% were co-infected with schistosomiasis (either Schistosoma haematobium or Schistosoma mansoni), and a mere 0.1% had co-infections with soil-transmitted helminths. At an 8% threshold for village-based MDA, approximately 1.1 million infected adults are ineligible to receive praziquantel from the village-based MDA. Children residing in households with improved latrines had a lower odds of H. nana infection than those without improved latrines did (adjusted odds ratio=0.87, 95% confidence interval=0.80–0.94, p=0.001). In countries where H. nana is endemic, such as Sudan, providers making MDA decisions should consider the prevalence of either H. nana or schistosomiasis, rather than focusing solely on the latter.

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From treatment to prevention: reimagining schistosomiasis control through WASH and environmental management
Morayo B. Adediran, Adedayo Adesida, Oluwadamilola O. Ezekiel, Precious C. Irabor, Blessing M. Babalola, Oyetunde T. Oyeyemi
Pathogens and Global Health.2025; : 1. CrossRef

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Functional characterization of glucose transporter 4 involved in glucose uptake in Clonorchis sinensis: Hojong Jun, Ernest Mazigo, Wang-Jong Lee, Yun-Kyu Park, Jin-Hee Han, Seok Ho Cha; Parasites Hosts Dis 2024;62(4):450-460.
Published online November 22, 2024; DOI: https://doi.org/10.3347/PHD.24051

Clonorchis sinensis, which causes clonorchiasis, is prevalent in East Asian countries and poses notable health risks, including bile duct complications. Although praziquantel is the primary treatment for the disease, the emerging resistance among trematodes highlights the need for alternative strategies. Understanding the nutrient uptake mechanisms in trematodes, including C. sinensis, is crucial for developing future effective treatments. This study aimed to characterize the function of C. sinensis glucose transporter 4 (CsGTP4) and determine its role in nutrient uptake employing synthesized cDNA of adult C. sinensis worms. The functional characterization of CsGTP4 involved injecting its cRNA into Xenopus laevis oocytes and analyzing the deoxy-D-glucose uptake levels. The results demonstrated that deoxy-D-glucose uptake depended on the deoxy-D-glucose incubation and CsGTP4 expression time, but not sodium-dependent. The concentration-dependent uptake followed the Michaelis–Menten equation, with a Km value of 2.7 mM and a Vmax value of 476 pmol/oocyte/h based on the Lineweaver–Burk analysis. No uptake of radiolabeled α-ketoglutarate, p-aminohippurate, taurocholate, arginine, or carnitine was observed. The uptake of deoxy-D-glucose by CsGTP4 was significantly inhibited by unlabeled glucose and galactose in a concentration-dependent manner. It was significantly inhibited under strongly acidic and basic conditions. These insights into the glucose uptake kinetics and pH dependency of CsGTP4 provide a deeper understanding of nutrient acquisition in trematodes. This study contributes to the development of novel antiparasitic agents, addressing a considerable socioeconomic challenge in affected regions.

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Clonorchis sinensis dopamine transporter (CsDAT) facilitates dopamine uptake
Wang-Jong Lee, Sung-Jun Kim, Woon Kyu Lee, Jin-Hee Han, Seok Ho Cha
Parasites, Hosts and Diseases.2025; 63(3): 215. CrossRef

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Clinical characteristics of toxoplasmosis patients in Korea: A retrospective study using health insurance review and assessment service data and electronic medical records: Do-Won Ham, Bong-Kwang Jung, Ji-Hun Shin, Yong Joon Kim, Kyoung Yul Seo, Seung Mi Lee, Jae Hyoung Im, Jeong-Ran Kwon, Ho-Sung Lee, Kyung-Won Hwang, Eun-Hee Shin; Parasites Hosts Dis 2024;62(4):424-437.
Published online November 22, 2024; DOI: https://doi.org/10.3347/PHD.24001

This study aimed to elucidate the clinical characteristics of patients diagnosed with toxoplasmosis in Korea. We collected and analyzed the specific research data of 5,917 patients from the Health Insurance Review and Assessment (HIRA; 2007–2020) and 533 electronic medical records (EMRs; 2003–2021) of Korean patients. The HIRA data showed that toxoplasmosis is an endemic disease that occurs constantly in Korea, with a large proportion of patients complaining of ocular symptoms. Of the 533 patients for whom EMR data were available, 54.6% were diagnosed with toxoplasmosis; ocular toxoplasmosis (35.7%), congenital toxoplasmosis (4.7%), cerebral toxoplasmosis (4.1%), pulmonary toxoplasmosis (0.4%), and toxoplasma hepatitis (0.6%), in order of frequency. In ocular cases, 54.4% of the patients had diverse ocular pathologies. Toxoplasmosis in Korea is characterized by a high frequency of ocular symptoms, most patients are adults, and 51.8% of patients with seropositivity were positive for IgG, suggesting prior infection. This study highlights that patients with ocular symptoms are included in the major diagnosis group for acquired toxoplasmosis in Korea.

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Detection of intestinal parasites in leopard cat fecal samples using shotgun metagenomics
Jun Ho Choi, Singeun Oh, Myung-hee Yi, Dongjun Kang, Du-Yeol Choi, Xavier Chavarria, Arwa Shatta, Yoon Hee Cho, Seongjun Choe, Seung-Hun Lee, Ju Yeong Kim
Parasites, Hosts and Diseases.2025; 63(4): 349. CrossRef

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Dynamin 2-mediated endocytosis of BLT1 is required for IL-8 production in HMC-1 cells induced by Trichomonas vaginalis-derived secretory products: Young Ah Lee, Myeong Heon Shin; Parasites Hosts Dis 2024;62(3):281-293.
Published online August 26, 2024; DOI: https://doi.org/10.3347/PHD.24049

We previously reported that leukotriene B₄ (LTB₄) contained in Trichomonas vaginalis-derived secretory products (TvSP) play an essential role in interleukin-8 (IL-8) production in human mast cell line (HMC-1 cells) via LTB₄ receptor (BLT)-mediated Nuclear Factor-kappa B (NF-_кB) activation. Dynamin, a GTPase, has been known to be involved in endocytosis of receptors for signaling of production of cytokine or chemokines. In the present study, we investigated the role of dynamin-mediated BLT1 endocytosis in TvSP-induced IL-8 production. When HMC-1 cells were transfected with BLT1 or BLT2 siRNA, TvSP-induced IL-8 production was significantly inhibited compared with that in cells transfected with control siRNA. In addition, pretreatment of HMC-1 cells with a dynamin inhibitor (Dynasore) reduced IL-8 production induced by TvSP or LTB₄. TvSP- or LTB₄- induced phosphorylation of NF-_кB was also attenuated by pretreatment with Dynasore. After exposing HMC-1 cells to TvSP or LTB₄, BLT1 was translocated from the intracellular compartments to the plasma membrane within 30 min. At 60 min after stimulation with TvSP or LTB₄, BLT1 remigrated from the cell surface to intracellular areas. Pretreatment of HMC-1 cells with dynamin-2 siRNA blocked internalization of BLT1 induced by TvSP or LTB₄. Co-immunoprecipitation experiments revealed that dynamin-2 strongly interacted with BLT1 60 min after stimulation with TvSP or LTB₄. These results suggest that T. vaginalis-secreted LTB₄ induces IL-8 production in HMC-1 cells via dynamin 2-mediated endocytosis of BLT1 and phosphorylation of NF-_кB.

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Detection of trichomonads in induced sputum from asthma patients in Korea
Myung-hee Yi, Myungjun Kim, Jun Ho Choi, Yoon Hee Cho, Hyun Kyung Oh, Jung-Won Park, Ju Yeong Kim
Parasites, Hosts and Diseases.2025; 63(3): 254. CrossRef

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A case of disseminated strongyloidiasis diagnosed by worms in the urinary sediment: Young-Ha Lee; Parasites Hosts Dis 2024;62(2):238-242.
Published online May 27, 2024; DOI: https://doi.org/10.3347/PHD.23124

Abstract
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Strongyloidiasis is a chronic infection caused by the intestinal nematode parasite Strongyloides stercoralis and is characterized by a diverse spectrum of nonspecific clinical manifestations. This report describe a case of disseminated strongyloidiasis with urination difficulty, generalized weakness, and chronic alcoholism diagnosed through the presence of worms in the urinary sediment. A 53-year-old man was hospitalized for severe abdominal distension and urinary difficulties that started 7–10 days prior. The patient also presented with generalized weakness that had persisted for 3 years, passed loose stools without diarrhea, and complained of dyspnea. In the emergency room, approximately 7 L of urine was collected, in which several free-living female adult and rhabditiform larvae of S. stercoralis, identified through their morphological characteristics and size measurements, were detected via microscopic examination. Rhabditiform larvae of S. stercoralis were also found in the patient’s stool. During hospitalization, the patient received treatment for strongyloidiasis, chronic alcoholism, peripheral neurosis, neurogenic bladder, and megaloblastic anemia, and was subsequently discharged with improved generalized conditions. Overall, this report presents a rare case of disseminated strongyloidiasis in which worms were detected in the urinary sediment of a patient with urination difficulties and generalized weakness combined with chronic alcoholism, neurogenic bladder, and megaloblastic anemia.

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Tropical gastrointestinal infections of contemporary public health importance
Carlos Seas, Pedro Legua
Current Opinion in Infectious Diseases.2025; 38(5): 426. CrossRef

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Comparative analysis of essential oil efficacy against the Asian longhorned tick Haemaphysalis longicornis (Acari: Ixodidae): Mohammad Saiful Islam, Md. Samiul Haque, Myung-Jo You; Parasites Hosts Dis 2024;62(2):217-225.
Published online May 27, 2024; DOI: https://doi.org/10.3347/PHD.23097

Abstract
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This study evaluated the potential repellent and acaricidal effects of 4 essential oils (clove, eucalyptus, lavender, and mint) against the Asian longhorned tick Haemaphysalis longicornis, a vector of various tick-borne diseases in medical and veterinary contexts. Selected for their potential repellent and acaricidal properties, the 4 essential oils were tested on adult and nymph H. longicornis ticks at different concentrations. The experiment assessed mortality rates and repellency, particularly during tick attachment to host skin. There was a significant increase (p<0.05) in tick mortality and repellency scores across all groups. At a 1% concentration, adult tick mortality ranged from 36% to 86%, while nymph mortality ranged from 6% to 97%. Clove oil exhibited notable efficacy, demonstrating high mortality rates of nymphs and adults. Clove oil also displayed strong repellency properties, with a repellency index of 0.05, surpassing those of mint, eucalyptus, and lavender oils. Clove oil showed the highest effectiveness in deterring nonattached adult ticks (90%) and nymphs (95%) when applied to skin. Clove oil was the most effective against adult and nymph ticks, achieving mortality rates of 86% and 97%, respectively, and led to the highest nonattachment rates when applied to skin. In conclusion, essential oils such as clove, eucalyptus, lavender, and mint oils present promising results for tick population control.

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Comprehensive antigen identification and comparative analysis: significant approaches for controlling Haemaphysalis longicornis ticks
Md. Samiul Haque, Bumseok Kim, Myung-Jo You
Journal of Veterinary Science.2025;[Epub] CrossRef

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Morphological and molecular characteristics of Paralecithodendrium longiforme (Digenea: Lecithodendriidae) adults and cercariae from Chinese pipistrelle bats and viviparid snails in Thailand: Thitichai Arttra, Pheravut Wongsawad, Chalobol Wongsawad, Nattawadee Nantarat, Preeyaporn Butboonchoo, Jong-Yil Chai; Parasites Hosts Dis 2024;62(1):85-97.
Published online February 23, 2024; DOI: https://doi.org/10.3347/PHD.23106

Abstract
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This study aimed to describe the morphological and molecular characteristics of Paralecithodendrium longiforme (Digenea: Lecithodendriidae) adults and cercariae isolated in Thailand. Adult flukes were isolated from the Chinese pipistrelle bat (Hypsugo sp.), and cercariae were detected in the viviparid snail (Filopaludina martensi martensi) from Chiang Mai province. The morphological characteristics were observed and described using conventional methods, and the molecular characteristics with internal transcribed spacer 2 (ITS2) and 28S rDNA gene sequences. The adult flukes were fusiform, 0.84–0.98 mm in length, and 0.37–0.49 mm in width, and were distinguishable from other species by the presence of longitudinal uterine coils. The cercariae were nonvirgulate xiphidiocercariae, with the oral sucker bigger than the acetabulum, the tail without fin fold, a body size of 117.5–138.3 × 48.3–52.2 µm, and a tail size of 100.7–103.7 × 15.0–18.9 µm. Molecular studies revealed that the adults and cercariae shared 99.3% (ITS2) and 99.6% (28S rDNA) homology with each other. They were phylogenetically close to P. longiforme with an identity of 94.5% for ITS2 and 98.7% for 28S rDNA. This study provides new information on the natural definitive host and first intermediate host of P. longiforme in Thailand. The discovery of its cercarial stage in Filopaludina snails highlights the importance of monitoring the associated second intermediate host and prevention and control of this potentially zoonotic trematode.

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Bithyniid snails (Gastropoda: Bithyniidae) infected with Xiphidiocercariae in Thailand include a new record of Bithynia siamensis siamensis as the intermediate host of Plagiorchis and Paralecithodendrium
Abdulhakam Dumidae, Jiranun Ardpairin, Supawan Pansri, Chanatinat Homkaew, Mayura Nichitcharoen, Aunchalee Thanwisai, Apichat Vitta, Hudson Alves Pinto
PLOS ONE.2025; 20(2): e0317052. CrossRef

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Infection characteristics of Metagonimus species (Digenea: Heterophyidae) metacercariae in fish from major rivers of Korea: Woon-Mok Sohn; Parasites Hosts Dis 2024;62(1):1-29.
Published online February 23, 2024; DOI: https://doi.org/10.3347/PHD.23096

This article analyzed the infection characteristics of metacercariae of Metagonimus spp. (MsMc) in fish from 9 major water systems in Korea. A total of 19,568 fish in 87 species were examined over a period of 10 years (2011–2020). MsMc were detected in fish from all 44 survey areas in 9 water systems. Most of the surveyed sites showed very low and low infection levels (66.7%), while 33.3% of the areas, such as Tamjin-gang and Seomjin-gang, revealed moderate and high infection levels. High endemicity depends on the abundance of susceptible fish species, especially sweet smelt (Plecoglosus altivelis). The susceptibility index (SI) with MsMc in index fish, Zacco spp., was very low and low levels in 62.0%, moderate in 28.0%, and high in 10.0% regions. The SI was highest in the following order: Yeongam-cheon (283.8), Hoeng-cheon (192.3), Togyo-jeosuji (131.2), Deokcheon-gang (119.1), and Joyang-gang (106.3). The recent infection status of MsMc in P. altivelis was analyzed by the survey localities. In addition, except for P. altivelis, 9 fish species were highly infected with MsMc in some survey areas, including Zacco platypus, Z. koreanus, Z. temminckii, Opsariichthys uncirostris, Rhynchocypris oxycephalus, Carassius auratus, Acheilognathus rhombeus, Onchorhynchus masou, and Tribolodon hakonensis. In Korea, 74 fish species (15 families) are collectively listed as second intermediate hosts of Metagonimus spp. This review provides several novel characteristics of MsMc infection and clarifies the fish species of second intermediate host of Metagonimus spp. in this country.

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Detection of intestinal parasites in leopard cat fecal samples using shotgun metagenomics
Jun Ho Choi, Singeun Oh, Myung-hee Yi, Dongjun Kang, Du-Yeol Choi, Xavier Chavarria, Arwa Shatta, Yoon Hee Cho, Seongjun Choe, Seung-Hun Lee, Ju Yeong Kim
Parasites, Hosts and Diseases.2025; 63(4): 349. CrossRef

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Pathological fracture induced by Halicephalobus gingivalis (Nematoda: Rhabditida) in a horse limb: Ticiana Meireles Sousa, Hugo Shisei Toma, Antonio de Pádua Lima, Antonio Carlos Cunha Lacreta Junior, Maira Meira Nunes, Ana Paula Cassiano da Silva, Daniel Wouters, Adriana Silva Albuquerque, Mary Suzan Varaschin, Djeison Lutier Raymundo, Claudia Dias Monteiro Toma, Fernando Arévalo Batista; Parasites Hosts Dis 2024;62(1):131-138.
Published online February 23, 2024; DOI: https://doi.org/10.3347/PHD.23066

Abstract
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Halicephalobus gingivalis is a free-living nematode that occasionally causes infections in horses. We report a rare case of limb fracture of horse caused by infection with H. gingivalis. An 8-year-old mare was referred to the Veterinary Hospital of the Federal University of Lavras with claudication grade 5 of the right hind limb, that had been started 3 months ago. The patient had aseptic arthritis in the tarsal joint and edema that extended to the quartile. The radiographic examination showed punctate osteolysis with exacerbation of bone trabeculation along the calcaneus, talus, proximal epiphysis of the third metatarsal and distal epiphysis of the tibia. Treatment for arthritis was initiated, and the animal showed a slight improvement in limb function. However, 21 days after hospitalization, due to a comminuted fracture of the tibia, it was euthanized. At necropsy, yellowish masses were found from the metatarsal to the tibia, and around the tarsal bones and joint. Similar masses were also found in the left kidney. Numerous nematodes compatible with H. gingivalis were identified. This is the first description of a pathological fracture caused by H. gingivalis infection in an equine limb.

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Halicephalobus gingivalis infection in equids
Simone Peletto
UK-Vet Equine.2024; 8(6): 286. CrossRef

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Brief Communication

Original Article

Brief Communication

Original Article

Mini Review

Original Articles

Mini Review

Original Articles

Brief Communications

Original Article

Case Report

Mini Review

Original Article

Brief Communication

Original Articles

Case Report

Original Articles

Mini Review

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