Parasites, Hosts and Diseases

"Tai-Soon Yong"

Original Articles

The storage mite Tyrophagus putrescentiae induces greater lung inflammation than house dust mites in mice: Eun-Min Kim, Ju Yeong Kim, You Shine Kwak, Myung-Hee Yi, Tai-Soon Yong; Parasites Hosts Dis 2024;62(3):365-377.
Published online August 26, 2024; DOI: https://doi.org/10.3347/PHD.24032

Abstract
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Exposure to storage mite (SM) and house dust mite (HDM) allergens is a risk factor for sensitization and asthma development; however, the related immune responses and their pathology have not been fully investigated. The HDMs Dermatophagoides farinae and Dermatophagoides pteronyssinus and SM Tyrophagus putrescentiae are potent allergens that induce asthma. Most SM-related studies have focused on the allergic reactions of individuals by measuring their immunoglobulin (Ig)E expression. Considering the limited research on this topic, the present study aims to investigate the differences in the immune responses induced by HDMs and SMs and histologically analyze lung tissues in a mouse asthma model to understand the differential effects of HDM and SM. The results revealed that all mite species induced airway inflammation. Mice challenged with T. putrescentiae had the highest airway resistance and total cell, eosinophil, and neutrophil counts in the bronchoalveolar lavage fluid (BALF). The SM-sensitized groups showed more severe lesions and mucus hypersecretions than the HDM-sensitized groups. Although the degree of HDM and SM exposure was the same, the damage to the respiratory lung tissue was more severe in SM-exposed mice, which resulted in excessive mucin secretion and increased fibrosis. Furthermore, these findings suggest that SM sensitization induces a more significant hypersensitivity response in mucosal immunity than HDM sensitization in asthma models.

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Alterations in immunized antigens of Anisakis pegreffii by ampicillin-induced gut microbiome changes in mice: Myungjun Kim, Jun Ho Choi, Myung-hee Yi, Singeun Oh, Tai-Soon Yong, Ju Yeong Kim; Parasites Hosts Dis 2024;62(3):351-364.
Published online August 26, 2024; DOI: https://doi.org/10.3347/PHD.23114

Abstract
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The gut microbiome plays an essential role in host immune responses, including allergic reactions. However, commensal gut microbiota is extremely sensitive to antibiotics and excessive usage can cause microbial dysbiosis. Herein, we investigated how changes in the gut microbiome induced by ampicillin affected the production of IgG1 and IgG2a antibodies in mice subsequently exposed to Anisakis pegreffii antigens. Ampicillin treatment caused a notable change in the gut microbiome as shown by changes in both alpha and beta diversity indexes. In a 1-dimensional immunoblot using Anisakis-specific anti-mouse IgG1, a 56-kDa band corresponding to an unnamed Anisakis protein was detected using mass spectrometry analysis only in ampicillin-treated mice. In the Anisakis-specific anti-mouse IgG2a-probed immunoblot, a 70-kDa band corresponding to heat shock protein 70 (HSP70) was only detected in ampicillin-treated and Anisakis-immunized mice. A 2-dimensional immunoblot against Anisakis extract with immunized mouse sera demonstrated altered spot patterns in both groups. Our results showed that ampicillin treatment altered the gut microbiome composition in mice, changing the immunization response to antigens from A. pegreffii. This research could serve as a basis for developing vaccines or allergy immunotherapies against parasitic infections.

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Brief Communications

Morphological studies of fly puparia (Diptera: Calliphoridae) in the soil from a Joseon Dynasty grave in Korea: In-Yong Lee, Ju Yeong Kim, Jung-Min Park, Ji Ho Seo, Bo-Young Jeon, Tai-Soon Yong, Min Seo; Parasites Hosts Dis 2023;61(4):471-475.
Published online November 28, 2023; DOI: https://doi.org/10.3347/PHD.23047

Abstract
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Archaeoentomological investigations were conducted on soil contents from a grave belonging to the Joseon Dynasty as part of the Urban Environment Maintenance Project (UEMP) in Cheongjin 12–16 dong (districts), Jongno-gu, Seoul, Korea, from December 01, 2008 to February 19, 2011. A total of 28 insect puparia with hard shells of the common green bottle fly Lucilia sericata were identified in the soil. Evidence suggested that the corpse was placed outside for some days instead of being buried immediately after death. This is the first report of fly puparia in soil samples from a tomb of the Joseon Dynasty during 16–17 AD in Korea. Our findings may help determine the timeframe of burial and offer archaeological insights into the funerary customs of the period.

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Intestinal parasitic infections among children aged 12–59 months in Nyamasheke District, Rwanda: Evariste Hakizimana, Ju Yeong Kim, Singeun Oh, Moonsoo Yoon, Tai-Soon Yong; Parasites Hosts Dis 2023;61(3):304-309.
Published online August 21, 2023; DOI: https://doi.org/10.3347/PHD.23045

Abstract
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Intestinal parasitic infections are a public health burden and a major cause of illness in developing countries. The diseases lead to various health threats, including growth retardation and mental health-related disorders, especially in children. We assessed the risk factors for intestinal parasitic infections among children aged 12–59 months residing in Nyamasheke District, Rwanda. A cross-sectional descriptive study was conducted using secondary data from 1,048 children aged 12–59 months whose stool samples were examined for the presence of intestinal parasites and whose results were registered in the laboratory information system in 2020. The prevalence of intestinal parasites in children aged 12–59 months was 53.2%. The dominant parasites were Ascaris lumbricoides (13.1%), followed by Giardia lamblia (10.9%), Entamoeba histolytica (7.9%), Trichuris trichiura (6.5%), hookworms (1.7%), and Taenia species (1.4%). A significant association was observed between intestinal parasites and the literacy of mothers or children’s caregivers (odds ratio (OR)=5.09, P<0.001). Children from farming households were 2.8-fold more likely to contract intestinal parasitic infections than those from nonfarming households (OR=2.8, P<0.001). A significant association was also observed between intestinal parasites and food safety (OR=4.9, P<0.001). Intestinal parasitic infections were significantly associated with hand hygiene practices after using the toilet and washing fresh fruits before eating (P<0.001). The information gathered will help public health providers and partners develop control plans in highly endemic areas in Rwanda.

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Intestinal Parasitic Infection and Associated Risk Factors Among Pre-school Children in a Deprived Community in Amasaman, Accra-Ghana
Isaac Anim-Baidoo, Ruth Afful, Akua Forson, Enid Owusu, Michael Olu-Taiwo, Emmanuel Afutu, Eric Sampene-Donkor
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Malaria and helminths co‐infection—Effects on anaemia, iron and folate deficiencies in paediatric population in Ghana
Opoku Bempah, Kwasi Baako Antwi, Mutala Abdul‐Hakim, Ibrahim Alhadj Moussa Mahamat, Kwadwo Boampong, John Larbi, Kingsley Badu
Tropical Medicine & International Health.2025; 30(9): 921. CrossRef
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Masceline Jenipher Mutsaka‐Makuvaza, Michael Olubusayo Binuyo, Callixte Cyuzuzo, Acsa Igizeneza, Jean Paul Sinumvayo, Oluwaremilekun Grace Ajakaye, Egie Elisha Enabulele, Zororo Chinwadzimba, Ezera Agwu, Nicholas Midzi
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Intestinal Parasites and Hematological Parameters in Children Living in Ambatoboeny District, Madagascar
Wanesa Richert, Daria Kołodziej, Danuta Zarudzka, Daniel Kasprowicz, Dariusz Świetlik, Krzysztof Korzeniewski
Pathogens.2024; 13(11): 930. CrossRef

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Original Articles

Prevalence of chigger mites and Orientia tsutsugamushi strains in northern regions of Gangwon-do, Korea: Soojin Kim, In Yong Lee, Sezim Monoldorova, Jiro Kim, Jang Hoon Seo, Tai-Soon Yong, Bo Young Jeon; Parasites Hosts Dis 2023;61(3):263-271.
Published online August 21, 2023; DOI: https://doi.org/10.3347/PHD.22148

The present study aimed to survey the prevalence of chigger mites and Orientia tsutsugamushi (O. tsutsugamushi) infection in the northern regions of Gangwon-do, Korea. From early February to early June 2015, a total of 17,050 chiggers were collected from striped field mice, Apodemus agrarius, in Cheorwon-gun, Hwacheon-gun, Yanggu-gun, and Goseong-gun, which are well-known endemic areas of scrub typhus in Korea. The chiggers were analyzed using molecular genomic methods, as previously described. Among the 7,964 identified chiggers, the predominant species was Leptotrombidium pallidum (76.9%), followed by L. zetum (16.4%), L. orientale (4.3%), L. palpale (0.3%), L. tectum (0.2%), and Neotrombicula tamiyai (1.8%). The chigger index (CI) was highest in Hwacheon (115.58), followed by Cheorwon (97.02), Yanggu (76.88), and Goseong (54.68). Out of the 79 O. tsutsugamushi-positive chigger pools, 67 (84.8%) were identified as the Boryong strain, 10 (12.7%) as the Youngworl strain, and only 2 were the Jecheon strain. Based on the high infestation of chiggers in striped field rodents and the high rate of O. tsutsugamushi infection in chigger mites, Hwacheon-gun and Cheorwon-gun are presumed to be high-risk areas for scrub typhus. Furthermore, L. pallidum, a major vector of scrub typhus, and the dominant O. tsutsugamushi serotype, the Boryong strain, were found in the northern regions of Gangwon-do, Korea.

Citations

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Geographic distribution of Orientia tsutsugamushi strains on chigger mites in the Republic of Korea (2021–2023)
Hyeon Seung Lee, Byung-Eon Noh, Hyunwoo Kim, Heeil Lee
Parasites & Vectors.2025;[Epub] CrossRef
Surveillance of Vector‐Borne Zoonotic Diseases in South Korea: Uncovering Novel Pathogen Carriers Among Rodents and Mites Nationwide
Beoul Kim, You-Jeong Lee, Hee Il Lee, Dongmi Kwak, Min-Goo Seo, Nan-hua Chen
Transboundary and Emerging Diseases.2024;[Epub] CrossRef
2022년 쯔쯔가무시증 매개 털진드기 감시 현황
세훈 조, 태규 김, 현우 김, 정원 주, 희일 이
Public Health Weekly Report.2023; 16(46): 1563. CrossRef

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Ampicillin treated German cockroach extract leads to reduced inflammation in human lung cells and a mouse model of Asthma: Seogwon Lee, Myung-Hee Yi, Yun Soo Jang, Jun Ho Choi, Myungjun Kim, Soo Lim Kim, Tai-Soon Yong, Ju Yeong Kim; Parasites Hosts Dis 2023;61(1):60-71.
Published online February 22, 2023; DOI: https://doi.org/10.3347/PHD.22147

Cockroaches can cause allergic sensitization in humans via contact with their feces or frass. Antibiotics can affect concentration of major allergen and total bacteria production in German cockroaches (Blattella germanica). This study examined the ability of antibiotic-treated German cockroaches to induce allergic airway inflammation and the effect of antibiotics on their lipopolysaccharide and Bla g1, 2, and 5 expression levels. Specifically, we measured the ability of German cockroach extract (with or without prior antibiotic exposure) to induce allergic inflammation in human bronchial epithelial cells and a mouse model of asthma. Bacterial 16S rRNA and lipopolysaccharide levels were lower in ampicillin-treated cockroaches than in the control group. The Bla g1, Bla g2, and Bla g5 expression in ampicillin-treated cockroaches decreased at both the protein and RNA levels. In human bronchial epithelial cell lines BEAS-2B exposed to the ampicillin-treated extract, expression levels of interleukin-6 and interleukin-8 were lower than that in the control group. The total cell count and eosinophil count in bronchoalveolar lavage fluid was also lower in mice exposed to the ampicillin-treated extract than in those exposed to normal cockroach extract. Mouse lung histopathology showed reduced immune cell infiltration and mucus production in the ampicillin group. Our results showed that ampicillin treatment reduced the symbiont bacterial population and major allergen levels in German cockroaches, leading to reduced airway inflammation in mice. These results can facilitate the preparation of protein extracts for immunotherapy or diagnostics applications.

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Asthma research in mice: An overview of current models and their methodological variability
Yan-Jiao Chen, Cai-Tao Chen, Gabriel Shimizu Bassi, Yong-Qing Yang
International Reviews of Immunology.2025; 44(3): 127. CrossRef
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Jose E Pietri, Maureen Laroche
Current Opinion in Insect Science.2025; 69: 101344. CrossRef
Multi-omics of cockroaches infected with Salmonella Typhimurium identifies molecular signatures of vector colonization
Diing DM Agany, Eduardo A. Callegari, Maria D. Paez, Jose E. Pietri
BMC Genomics.2025;[Epub] CrossRef
Microbiome of laboratory‐reared and environmentally collected cockroaches
Sohyeon Yun, Jun Ho Choi, Singeun Oh, Myungjun Kim, Myung‐hee Yi, Dongjun Kang, Yun Soo Jang, In‐Yong Lee, Tai‐Soon Yong, Juan Kim, Heung Chul Kim, Jae Rok Lee, Ju Yeong Kim
Entomological Research.2024;[Epub] CrossRef

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3 Web of Science
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Microbiome of Haemaphysalis longicornis Tick in Korea: Myungjun Kim, Ju Yeong Kim, Myung-hee Yi, In-Yong Lee, Dongeun Yong, Bo-Young Jeon, Tai-Soon Yong; Korean J Parasitol 2021;59(5):489-496.
Published online October 22, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.5.489

Ticks can transmit pathogenic bacteria, protozoa, and viruses to humans and animals. In this study, we investigated the microbiomes of Haemaphysalis longicornis according to sex and life stages. The Shannon index was significantly higher for nymphs than adult ticks. Principal coordinates analysis showed that the microbiome composition of female adult and male adult ticks were different. Notably, Coxiella-like bacterium (AB001519), known as a tick symbiont, was found in all nymphs and female adult ticks, but only one out of 4 male adult ticks had Coxiella-like bacterium (AB001519). In addition, Rickettsia rickettsii, Coxiella burnetii, and Anaplasma bovis were detected in this study.

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Vikas Sharma, Shriya Goel, Kamlesh Bisht, Taruna Kaura, Salony Verma, Abhishek Mewara, Gagandeep Singh Grover, Manisha Biswal
Veterinary Microbiology.2026; 312: 110783. 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
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Hye-Ryung Byun, Mi-Sun Rieu, Seong-Ryeong Ji, Hyun-Young Nam, Seulgi Seo, Chang-Yong Choi, Ki-Jeong Na, Jong-Taek Kim, Soyeon Cho, Bo-Yeon Hwang, Joon-Seok Chae
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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
Microbiome of Invasive Tick Species Haemaphysalis longicornis in North Carolina, USA
Loganathan Ponnusamy, Nicholas Travanty, D. Watson, Steven Seagle, Ross Boyce, Michael Reiskind
Insects.2024; 15(3): 153. CrossRef
Organ-specific bacterial microbiota in the engorged female Haemaphysalis longicornis ticks
Sisi Li, Chen Yang, Yufan Zhang, Kaili Chen, Xiaoyu Zhang, Jingze Liu, Yankai Zhang
International Journal of Acarology.2024; 50(3): 320. CrossRef
Effect of Silencing subolesin and enolase impairs gene expression, engorgement and reproduction in Haemaphysalis longicornis (Acari: Ixodidae) ticks
Md. Samiul Haque, Mohammad Saiful Islam, Myung-Jo You
Journal of Veterinary Science.2024;[Epub] CrossRef
Microbiome of two adult tick species and their laboratory-reared offspring shows intra- and inter-species differences
Joshua Kamani, Jonathan Gonçalves-Oliveira, Jerome Nicolas Janssen, Joby Robleto Quesada, Yaarit Nachum-Biala, Shimon Harrus, Ricardo Gutiérrez
Acta Tropica.2024; 257: 107315. CrossRef
Comparative microbiome analysis of Haemaphysalis longicornis ticks at the Korea Combat Training Center in 2022
Minsung Kim, Singeun Oh, Myung‐hee Yi, Myungjun Kim, Sohyeon Yun, Jun Ho Choi, Moonsoo Yoon, Tai‐Soon Yong, Buddle Lee, Kyung Tae Noh, Quehn Park, Chanhee Lee, Ju Yeong Kim
Entomological Research.2023; 53(12): 627. CrossRef
Bacterial microbiota analysis demonstrates that ticks can acquire bacteria from habitat and host blood meal
Si-Si Li, Xiao-Yu Zhang, Xue-Jiao Zhou, Kai-Li Chen, Abolfazl Masoudi, Jing-Ze Liu, Yan-Kai Zhang
Experimental and Applied Acarology.2022; 87(1): 81. CrossRef
Characterization of Haemaphysalis longicornis microbiome collected from different regions of Korean peninsula
Min Kyu Sang, Jie eun Park, Dae Kwon Song, Jun Yang Jeong, Hee Ju Hwang, Hyun woo Kim, Tae Yun Kim, So Young Park, Se Won Kang, Bharat Bhusan Patnaik, Sung‐Jae Cha, Yeon Soo Han, Hee Il Lee, Yong Seok Lee
Entomological Research.2022; 52(6): 271. CrossRef
The toxicity of the monoterpenes from lemongrass is mitigated by the detoxifying symbiosis of bacteria and fungi in the tick Haemaphysalis longicornis
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Ecotoxicology and Environmental Safety.2022; 247: 114261. CrossRef

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Geographical Distribution and Epidemiologic Factors of Chigger Mites on Apodemus agrarius during Autumn in Korea: In Yong Lee, Jae-Won Lim, Jang Hoon Seo, Heung Chul Kim, Ku Jae Lee, Tai-Soon Yong, Won-Ja Lee, Jae-Ran Yu, Seobo Sim; Korean J Parasitol 2021;59(5):473-479.
Published online October 22, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.5.473

Abstract
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A nationwide survey of chigger mites causing scrub typhus and an investigation of epidemiologic factors for chigger mites was conducted at 16 localities in 8 provinces in Korea during autumn 2009, 2012, and 2013. A total of 233 Apodemus agrarius were captured, and all were infested with chigger mites. The chigger index was highest in Chungcheongbuk-do in 2009 (358.3) and 2012 (290.1) and Chungcheongnam-do in 2013 (294.4). The predominant chigger mite species was Leptotrombidium pallidum in the northern and central parts and L. scutellare in the southern and western parts, Korea. L. pallidum was not found in Jellanam-do and Gyeongsangnam-do and the distribution of L. scutellare had been expanded in the northern parts of Korea. The chigger index of L. pallidum was positively correlated with temperature and negatively correlated with humidity. The incidence of scrub typhus is dependent on L. scutellare index. These findings could be helpful to monitor the distribution of chigger mites and to develop a preventive measures for scrub typhus in Korea.

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Scrub typhus update: A re‑emerging global threat beyond the Tsutsugamushi Triangle and the physiological ramifications of scrub typhus infection (Review)
Ankur Vashishtha, Vivek Kumar, Gautam Panwar, Gaurav Kausik, Samaniya Baig, Prigya Sharma, Rajesh Yadav
World Academy of Sciences Journal.2025;[Epub] CrossRef
The Association Between Environmental Factors and Scrub Typhus: A Review
Shu Yang, Shu Yang, Yuxiang Xie, Wenjing Duan, Yiting Cui, Ai Peng, Yisheng Zhou, Yibing Fan, Hui Li, Peng Huang
Tropical Medicine and Infectious Disease.2025; 10(6): 151. CrossRef
Temperature effect on scrub typhus incidence in South Korea: the projection for climate change
Donghee Seo, Yoon-Jung Choi, Yun-Chul Hong
Postgraduate Medical Journal.2025;[Epub] CrossRef
Associations of meteorological factors and dynamics of scrub typhus incidence in South Korea: A nationwide time-series study
Taehee Chang, Kyung-Duk Min, Sung-il Cho, Yoonhee Kim
Environmental Research.2024; 245: 117994. CrossRef
The impact of meteorological parameters on the scrub typhus incidence in Baoshan City, western Yunnan, China
Yun-Yan Luo, Alan Frederick Geater, Jia-Xiang Yin
Frontiers in Public Health.2024;[Epub] CrossRef
Prevalence of chigger mites and Orientia tsutsugamushi strains in northern regions of Gangwon-do, Korea
Soojin Kim, In Yong Lee, Sezim Monoldorova, Jiro Kim, Jang Hoon Seo, Tai-Soon Yong, Bo Young Jeon
Parasites, Hosts and Diseases.2023; 61(3): 263. CrossRef
Molecular Identification of Bacillus Isolated from Korean Water Deer (Hydropotes inermis argyropus) and Striped Field Mouse (Apodemus agrarius) Feces by Using an SNP-Based 16S Ribosomal Marker
Md-Mafizur Rahman, Sang-Jin Lim, Yung-Chul Park
Animals.2022; 12(8): 979. CrossRef

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Brief Communication

Association between Sociodemographic Factors and Diarrhea in Children Under 5 Years in Rwanda: Umuhoza Claudine, Ju Yeong Kim, Eun-Min Kim, Tai-Soon Yong; Korean J Parasitol 2021;59(1):61-65.
Published online February 19, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.1.61

Abstract
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Diarrheal disease is the second leading cause of mortality and morbidity in children under 5 years old worldwide, and is the most common cause of malnutrition in sub-Saharan Africa. In Rwanda, diarrhea is the third leading cause of death in children under 5 years old. This study examined the association between sociodemographic factors and diarrhea in children under 5 years using the data of 7,474 households in the 2014-2015 Rwanda Demographic and Health Survey. Overall prevalence of diarrhea in this study was 12.7% in children. An increased risk for diarrhea was found for children aged 12-23 months (odds ratio (OR)=4.514), those with a low economic status (OR=1.64), those from the Western province (OR=1.439), those with poorly-educated mothers (OR=5.163), and those with families engaged in agricultural activities (OR=1.624). In conclusion, sociodemographic factors significantly affect the risk of developing diarrhea in children under 5 years in Rwanda. Designing and implementing health education promoting awareness of early interventions and rotavirus vaccination are essential to reduce diarrheal diseases for the Rwandan community.

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Asian Pacific Journal of Tropical Medicine.2021; 14(11): 479. CrossRef

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Original Article

Comparative Microbiome Analysis of Three Species of Laboratory-Reared Periplaneta Cockroaches: Seogwon Lee, Ju Yeong Kim, Myung-hee Yi, In-Yong Lee, Won-Ja Lee, Hye Su Moon, Dongeun Yong, Tai-Soon Yong; Korean J Parasitol 2020;58(5):537-542.
Published online October 22, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.5.537

Cockroaches inhabit various habitats, which will influence their microbiome. Although the microbiome can be influenced by the diet and environmental factors, it can also differ between species. Therefore, we conducted 16S rDNAtargeted high-throughput sequencing to evaluate the overall bacterial composition of the microbiomes of 3 cockroach species, Periplaneta americana, P. japonica, and P. fuliginosa, raised in laboratory for several generations under the same conditions. The experiments were conducted using male adult cockroaches. The number of operational taxonomic units (OTUs) was not significantly different among the 3 species. With regard to the Shannon and Pielou indexes, higher microbiome values were noted in P. americana than in P. japonica and P. fuliginosa. Microbiome composition was also evaluated, with endosymbionts accounting for over half of all OTUs in P. japonica and P. fuliginosa. Beta diversity analysis further showed that P. japonica and P. fuliginosa had similar microbiome composition, which differed from that of P. americana. However, we also identified that P. japonica and P. fuliginosa host distinct OTUs. Thus, although microbiome compositions may vary based on multiple conditions, it is possible to identify distinct microbiome compositions among different Periplaneta cockroach species, even when the individuals are reared under the same conditions.

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Kara A. Tinker, Elizabeth A. Ottesen
Frontiers in Microbiology.2021;[Epub] CrossRef

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Brief Communications

Molecular Detection of Toxoplasma gondii in Haemaphysalis Ticks in Korea: Ju Yeong Kim, You Shine Kwak, In-Yong Lee, Tai-Soon Yong; Korean J Parasitol 2020;58(3):327-331.
Published online June 26, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.3.327

Toxoplasma gondii are intracellular protozoa that can cause neurological disease or death in fetuses and even in immunocompromised human adults. Ticks are recognized as vectors of many microorganisms including viruses, bacteria, and protozoa. Recent studies detected T. gondii in various tick species in many countries. In this study, we performed PCR detection of the T. gondii B1 gene from Haemaphysalis ticks collected from vegetation in 4 localities, Wonju, Gunsan, Miryang, and Yangsan, in Korea. We analyzed DNA from 314 ticks (268 Haemaphysalis longicornis and 46 Haemaphysalis flava) and the B1 gene of T. gondii was detected in 13 of these. The detection of T. gondii in ticks differed significantly by region (P=0.021). T. gondii was detected in the following percentages of collected ticks: 3.7% (7 of 189) in Gunsan, 10% (5 of 50) in Wonju, 16.7% (1 of 6) in Yangsan, and 0% (0 of 69) in Miryang. The detection of T. gondii in ticks was not associated with tick species or development stage. This is the first report of T. gondii detection in ticks in Korea. Our results provide important information necessary to understand toxoplasmosis transmission.

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Bisma Khan, Sidra Batool, Sadia Shahnawaz, Shakir Ullah, Muhammad Naeem, Umme Habiba, Shaheen Akhter, Adil Khan, Furhan Iqbal
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Experimental and Applied Acarology.2021; 84(4): 809. CrossRef

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Phylogenetic Characteristics of Echinococcus granulosus Sensu Lato in Uzbekistan: Hye-Jin Kim, Tai-Soon Yong, Myeong Heon Shin, Kyu-Jae Lee, Gab-Man Park, Uktamjon Suvonkulov, Dmitriy Kovalenko, Hak Sun Yu; Korean J Parasitol 2020;58(2):205-210.
Published online April 30, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.2.205

Echinococcosis occurs mainly in areas with heavy livestock farming, such as Central Asia, America, and Australia. Echinococcus granulosus sensu lato (s.l.) infection causes echinococcosis in intermediate hosts, such as sheep, cattle, goats, camels, and horses. Numerous cases of echinococcosis occur in Uzbekistan as stock farming is a primary industry. Epidemiological and genetic studies of E. granulosus s.l. are very important for mitigating its impact on public health and the economy; however, there are no such studies on E. granulosus s.l. in Uzbekistan. In the present study, to determine which genotypes exist and are transmitted, we isolated Echinococcus sp. from definitive hosts (one isolate each from jackal and dog) and intermediate hosts (52 isolates from humans and 6 isolates from sheep) in Uzbekistan and analyzed the isolates by sequencing 2 mitochondrial DNA components (cox1 and nad1). The results showed that all of isolates except one belonged to the E. granulosus sensu stricto (s.s.) G1 and G3 genotypes. Phylogenetic analysis based on cox1 sequences showed that 42 isolates from humans, 6 isolates from sheep, and one isolate from jackal were the G1 genotype, whereas the remaining 8 isolates from human and the one isolate from dog were the G3 genotype. These results suggest that the G1 and G3 genotypes of E. granulosus s.s. are predominant in Uzbekistan, and both wild animals and domestic animals are important for maintaining their life cycle. Only one isolate from human sample was confirmed to be E. eqiinus (G4 genotype), which is known to be for the first time.

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Thomas Romig, Marion Wassermann
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Rui‐Qi Hua, Xiao‐Di Du, Xue He, Xiao‐Bin Gu, Yue Xie, Ran He, Jing Xu, Xue‐Rong Peng, Guang‐You Yang
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Original Article

Effectiveness of Mass Drug Administration on Neglected Tropical Diseases in Schoolchildren in Zanzibar, Tanzania: Ju Yeong Kim, Seobo Sim, Eun Joo Chung, Han-Jong Rim, Jong-Yil Chai, Duk-Young Min, Keeseon S. Eom, Khalfan A. Mohammed, Iddi S. Khamis, Tai-Soon Yong; Korean J Parasitol 2020;58(2):109-119.
Published online April 30, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.2.109

Abstract
PDF

Soil-transmitted helminths and Schistosoma haematobium affect more than 3 billion people globally and mainly occur in sub-Saharan Africa. The present study assessed the overall infection status of a 1716-student cohort of school-children in Zanzibar and applied mass drug administration (MDA) to the cohort from 2007 to 2009. Schools in Pemba, Zanzibar, had a much higher prevalence of soil-transmitted helminth infections than those in Unguja, and the Chaani, Ghana, and Machui schools of Unguja exhibited high S. haematobium infection rates. The MDA program only partially controlled parasite infections, owing to high rates of re-infection. The infection rate of S. haematobium across all 10 schools, for example, was only reduced by 1.8%, and even this change not significant, even though the S. haematobiuminfection rates of the Chaani and Mzambarauni schools were significantly reduced from 64.4 and 23.4%, respectively, at the first screening, to 7.3 and 2.3% at the last screening. The overall infection rate of Ascaris lumbricoides was reduced from 36.0% at the first screening to 22.6% at the last screening. However, the infection rates for both Trichuris trichiuraand hookworm were generally unaffected by MDA. In the future, parasite control programs should involve strategically designed MDA schedules and holistic intervention (e.g., sanitation improvement, hygiene behavior changes, and control of intermediated hosts).

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Maryline Vere, Wilma ten Ham-Baloyi, Paula Ezinne Melariri, Raquel Inocencio da Luz
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PLOS Neglected Tropical Diseases.2021; 15(10): e0009550. CrossRef

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Brief Communication

Echinostoma aegyptica (Trematoda: Echinostomatidae) Infection in Five Riparian People in Savannakhet Province, Lao PDR: Jong-Yil Chai, Bong-Kwang Jung, Taehee Chang, Hyejoo Shin, Woon-Mok Sohn, Keeseon S. Eom, Tai-Soon Yong, Duk-Young Min, Bounlay Phammasack, Bounnaloth Insisiengmay, Han-Jong Rim; Korean J Parasitol 2020;58(1):67-72.
Published online February 29, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.1.67

Abstract
PDF

Human infection with Echinostoma aegyptica Khalil and Abaza, 1924 (Trematoda: Echinostomatidae) is extremely rare. In this study, we confirmed E. aegyptica infection in 5 riparian residents living along the Mekong River in Savannakhet Province, Lao PDR. The patients revealed eggs of Opisthorchis viverrini/minute intestinal flukes, echinostomes, and other parasites in fecal examinations using the Kato-Katz technique. Following treatment with praziquantel 30-40 mg/kg and pyrantel pamoate 10-15 mg/kg in a single dose and purging with magnesium salts, adult specimens of various helminth species were collected. Among the trematodes, echinostome flukes of 4.5-7.6 mm in length (n = 134; av. 22.3 specimens per case) were of taxonomic interest and subjected in this study. The flukes were morphologically characterized by having total 43-45 collar spines arranged in 2 alternating rows (corner spines usually 5 on each side) and compatible with previous descriptions of E. aegyptica. The patients were mixed-infected with other helminths, so specific clinical manifestations due to this echinostome fluke were difficult to determine. The present paper describes for the first time human E. aegyptica infections in Lao PDR. This is the second report of human infection (2nd-6th cases) with E. aegyptica in the world following the first one from China.

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High endemicity of Opisthorchis viverrini infection among people in northern Cambodia confirmed by adult worm expulsion
Bong-Kwang Jung, Sooji Hong, Taehee Chang, Jaeeun Cho, Seungwan Ryoo, Keon Hoon Lee, Jeonggyu Lee, Woon-Mok Sohn, Sung-Jong Hong, Virak Khieu, Rekol Huy, Jong-Yil Chai
Scientific Reports.2023;[Epub] CrossRef
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Rafael Toledo, María Álvarez-Izquierdo, J. Guillermo Esteban, Carla Muñoz-Antoli
Parasitology.2022; 149(10): 1319. CrossRef
Echinostoma mekongi n. sp. (Digenea: Echinostomatidae) from Riparian People along the Mekong River in Cambodia
Jaeeun Cho, Bong-Kwang Jung, Taehee Chang, Woon-Mok Sohn, Muth Sinuon, Jong-Yil Chai
The Korean Journal of Parasitology.2020; 58(4): 431. CrossRef

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Original Article

Echinostoma macrorchis Metacercariae in Cipangopaludina chinensis malleata from Xiengkhuang Province, Lao PDR and Morphologies of Adults from Experimental Animals: Woon-Mok Sohn, Byoung-Kuk Na, Dongmin Lee, Keeseon S. Eom, Tai-Soon Yong, Jong-Yil Chai, Duk-Young Min; Korean J Parasitol 2019;57(6):657-664.
Published online December 31, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.6.657

Abstract
PDF

We identified the echinostome metacercariae in Chinese mystery snails, Cipangopaludina chinensis malleata, from Xiengkhuang Province, Lao PDR with morphologies of adult worms recovered. Total 20 snails were examined with artificial digestion method and then the collected metacercariae were orally infected to a mouse and a rat. Adult worms recovered from experimental animals were observed with a light microscope and a SEM. The metacercariae were round, 125×123 ?m in average size, with a moderately thick cyst wall, collar spines distributed in the head collar and excretory granules in 2 canals of excretory tube. Adult flukes (3-week-old in a rat) were elongated, ventrally curved and 5.310×1.023 mm in average size. Head collar distinct, bearing 43 collar spines with 5 end group ones on each side. Oral sucker subterminal, prepharynx very short, pharynx well developed, and esophagus relatively short. Cirrus sac well developed, with a saccular seminal vesicle, and ventral sucker very large. Ovary round and on the median line of the body. Testes tandom and elongated. Eggs operculated, elliptical and 90×57 ?m in average size. In the SEM observation, the head crown prominent, with 43 collar spines resembled with horns of younger stag. Scale-like tegumental spines were densely distributed on the surface between the head collar and ventral sucker, and their densities were decreased posteriorly. Conclusively, the metacercariae detected in C. chinensis malleata from Lao PDR were identified as those of Echinostoma macrorchis based on the morphological characteristics of adult worms.

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Wasin Panich, Thanawan Tejangkura, Thapana Chontananarth
Research in Veterinary Science.2025; 185: 105539. CrossRef
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Journal of Helminthology.2020;[Epub] CrossRef

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Brief Communications

Prevalence of Intestinal Helminth Infections in Dogs and Two Species of Wild Animals from Samarkand Region of Uzbekistan: Tai-Soon Yong, Kyu-Jae Lee, Myeong Heon Shin, Hak Sun Yu, Uktamjon Suvonkulov, Turycin Bladimir Sergeevich, Azamat Shamsiev, Gab-Man Park; Korean J Parasitol 2019;57(5):549-552.
Published online October 31, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.5.549

Abstract
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This study aimed to determine the prevalence of intestinal helminth parasitic infections and associated risk factors for the human infection among the people of Samarkand, Uzbekistan. Infection status of helminths including Echinococcus granulosus was surveyed in domestic and wild animals from 4 sites in the Samarkand region, Uzbekistan during 2015-2018. Fecal samples of each animal were examined with the formalin-ether sedimentation technique and the recovery of intestinal helminths was performed with naked eyes and a stereomicroscope in total 1,761 animals (1,755 dogs, 1 golden jackal, and 5 Corsac foxes). Total 658 adult worms of E. granulosus were detected in 28 (1.6%) dogs and 1 (100%) golden jackal. More than 6 species of helminths, i.e., Taenia hydatigena, Dipylidium caninum, Diplopylidium nolleri, Mesocestoides lineatus, Toxocara canis, and Trichuris vulpis, were found from 18 (1.0%) dogs. Six (T. hydatigena, Toxascaris leonina, Alaria alata, Uncinaria stenocephala, D. caninum, and M. lineatus) and 2 (D. nolleri and M. lineatus) species of helminths were also detected from 5 Corsac foxes and 1 golden jackal, respectively. Taeniid eggs were found in 2 (20%) out of 10 soil samples. In the present study, it was confirmed that the prevalences of helminths including E. granulosus are not so high in domestic and wild animals. Nevertheless, the awareness on the zoonotic helminth infections should be continuously maintained in Uzbekistan for the prevention of human infection.

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Molecular identification and phylogenetic positioning of nematodes Toxocara canis, T. cati (Ascarididae) and Toxascaris leonina (Toxocaridae) from domestic and wild carnivores in the Fergana Valley, Uzbekistan
A. E. Kuchboev, A. G. Sotiboldiyev, B. K. Ruziev, A. A. Safarov
Biosystems Diversity.2025; 33(3): e2538. CrossRef
High-Quality Chromosome-Level Genome Assembly of the Corsac Fox (Vulpes corsac) Reveals Adaptation to Semiarid and Harsh Environments
Zhihao Zhang, Tian Xia, Shengyang Zhou, Xiufeng Yang, Tianshu Lyu, Lidong Wang, Jiaohui Fang, Qi Wang, Huashan Dou, Honghai Zhang
International Journal of Molecular Sciences.2023; 24(11): 9599. CrossRef
Time series modeling of animal bites
Fatemeh Rostampour, Sima Masoudi
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Diagnostic tools for the detection of taeniid eggs in different environmental matrices: A systematic review.
Ganna Saelens, Lucy Robertson, Sarah Gabriël
Food and Waterborne Parasitology.2022; 26: e00145. CrossRef
Fleas from the Silk Road in Central Asia: identification of Ctenocephalides canis and Ctenocephalides orientis on owned dogs in Uzbekistan using molecular identification and geometric morphometrics
Georgiana Deak, Alisher Safarov, Xi Carria Xie, Runting Wang, Andrei Daniel Mihalca, Jan Šlapeta
Parasites & Vectors.2022;[Epub] CrossRef
Control of cystic echinococcosis in the Middle Atlas, Morocco: Field evaluation of the EG95 vaccine in sheep and cesticide treatment in dogs
Fatimaezzahra Amarir, Abdelkbir Rhalem, Abderrahim Sadak, Marianne Raes, Mohamed Oukessou, Aouatif Saadi, Mohammed Bouslikhane, Charles G. Gauci, Marshall W. Lightowlers, Nathalie Kirschvink, Tanguy Marcotty, María-Gloria Basáñez
PLOS Neglected Tropical Diseases.2021; 15(3): e0009253. CrossRef
Co-infection of Trichuris vulpis and Toxocara canis in different aged dogs: Influence on the haematological indices
I. V. Saichenko, A. A. Antipov, T. I. Bakhur, L. V. Bezditko, S. S. Shmayun
Biosystems Diversity.2021; 29(2): 129. CrossRef
Spread and seasonal dynamics of dogs helminthiasis in BilaTserkva district
I. Saichenko
Naukovij vìsnik veterinarnoï medicini.2021; (1(165)): 119. CrossRef
Monitoring of parasitic diseases of dogs
Bogdan Morozov, Andrii Berezovskyi
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An epizootic situation is in relation to the nematodosiss of gastroenteric channel of dogs
I. Saichenko, A. Antipov
Naukovij vìsnik veterinarnoï medicini.2020; (1(154)): 54. CrossRef

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Echinochasmus caninus n. comb. (Trematoda: Echinostomatidae) Infection in Eleven Riparian People in Khammouane Province, Lao PDR: Jong-Yil Chai, Taehee Chang, Bong-Kwang Jung, Hyejoo Shin, Woon-Mok Sohn, Keeseon S. Eom, Tai-Soon Yong, Duk-Young Min, Bounlay Phammasack, Bounnaloth Insisiengmay, Han-Jong Rim; Korean J Parasitol 2019;57(4):451-456.
Published online August 31, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.4.451

Abstract
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Adult specimens of Echinochasmus caninus n. comb. (Verma, 1935) (Trematoda: Echinostomatidae) (syn. Episthmium caninum Yamaguti, 1958) were recovered from 11 riparian people who resided along the Mekong River in Khammouane Province, Lao PDR. In fecal examinations done by the Kato-Katz technique, the cases revealed eggs of Opisthorchis viverrini/minute intestinal flukes, hookworms, and in 2 cases echinostome eggs. To recover the adult helminths, praziquantel 30-40 mg/kg and pyrantel pamoate 10-15 mg/kg in a single dose were given and purged with magnesium salts. Various species of trematodes (including O. viverrini and Haplorchis spp.), cestodes, and nematodes were recovered from their diarrheic stools. Among the trematodes, small echinostome flukes (n=42; av. 3.8 specimens per case) of 0.7-1.2 mm in length are subjected in this study. They are morphologically characterized by having 24 collar spines interrupted dorsally and anterior extension of vitellaria from the cirrus sac or genital pore level to the posterior end of the body. Particularly based on this extensive distribution of vitellaria, the specific diagnosis was made as Echinochasmus caninus. The cases were co-infected with various other helminth parasites; thus, clinical manifestations specific for this echinostome infection were difficult to determine. The present paper describes for the first time human E. caninus infections in Lao PDR. Our cases marked the 4-14th human infections with this echinostome around the world following the 3 previous cases reported from Thailand.

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Neglected food-borne trematodiases: echinostomiasis and gastrodiscoidiasis
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General overview of the current status of human foodborne trematodiasis
Jong-Yil Chai, Bong-Kwang Jung
Parasitology.2022; 149(10): 1262. CrossRef
Echinostoma aegyptica (Trematoda: Echinostomatidae) Infection in Five Riparian People in Savannakhet Province, Lao PDR
Jong-Yil Chai, Bong-Kwang Jung, Taehee Chang, Hyejoo Shin, Woon-Mok Sohn, Keeseon S. Eom, Tai-Soon Yong, Duk-Young Min, Bounlay Phammasack, Bounnaloth Insisiengmay, Han-Jong Rim
The Korean Journal of Parasitology.2020; 58(1): 67. CrossRef
Echinostoma mekongi n. sp. (Digenea: Echinostomatidae) from Riparian People along the Mekong River in Cambodia
Jaeeun Cho, Bong-Kwang Jung, Taehee Chang, Woon-Mok Sohn, Muth Sinuon, Jong-Yil Chai
The Korean Journal of Parasitology.2020; 58(4): 431. CrossRef
Echinostoma macrorchis Metacercariae in Cipangopaludina chinensis malleata from Xiengkhuang Province, Lao PDR and Morphologies of Adults from Experimental Animals
Woon-Mok Sohn, Byoung-Kuk Na, Dongmin Lee, Keeseon S. Eom, Tai-Soon Yong, Jong-Yil Chai, Duk-Young Min
The Korean Journal of Parasitology.2019; 57(6): 657. CrossRef

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Prevalence of Tick-Borne Pathogens from Ticks Collected from Cattle and Wild Animals in Tanzania in 2012: Tae Yun Kim, You Shine Kwak, Ju Yeong Kim, Sung-Hyun Nam, In-Yong Lee, Simon Mduma, Julius Keyyu, Robert Fyumagwa, Tai-Soon Yong; Korean J Parasitol 2018;56(3):305-308.
Published online June 30, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.3.305

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This study was aimed to disclose the prevalence rate of tick-borne pathogens from ticks collected from cattle and wild animals in Tanzania in 2012. Ticks were collected from slaughtered cattle and dead wild animals from November 5 to December 23, 2012 and identified. PCR for detecting Anaplasmataceae, Piroplamidae, Rickettsiaceae, Borrelia spp., and Coxiella spp. were done. Among those tested, Rickettsiaceae, Piroplasmidae, and Anaplasmataceae, were detected in ticks from the 2 regions. Rickettsiaceae represented the major tick-borne pathogens of the 2 regions. Ticks from animals in Maswa were associated with a higher pathogen detection rate compared to that in ticks from Iringa. In addition, a higher pathogen detection rate was observed in ticks infesting cattle than in ticks infesting wild animals. All examined ticks of the genus Amblyomma were infected with diverse pathogens. Ticks of the genera Rhipicephalus and Hyalomma were infected with 1 or 2 pathogens. Collectively, this study provides important information regarding differences in pathogen status among various regions, hosts, and tick species in Tanzania. Results in this study will affect the programs to prevent tick-borne diseases (TBD) of humans and livestock in Tanzania.

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Tick Diversity and Distribution of Pathogen in Ticks Collected from Wild Animals and Vegetation in Africa
Roland Eric Yessinou, Aldric Koumassou, Haruna Baba Galadima, Hospice Nanoukon-Ahigan, Souaïbou Farougou, Martin Pfeffer
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Molecular detection and prevalence of Anaplasma and Rickettsia species in rodents captured from wildlife-human interfaces in Iringa and Morogoro regions, Tanzania
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Tidjani A. Djiman, Abel S. Biguezoton, Claude Saegerman
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Nejib Doss, Aldo Morrone, Patrizia Forgione, Giusto Trevisan, Serena Bonin
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Stephanie Osip, Morgan Friedman, Ellen Haynes, Sarah M. Coker, John A. Bryan II, Metinou Sidouin, Philip Tchindebet Ouakou, Bongo Nare Richard Ngandolo, Christopher A. Cleveland, Michael J. Yabsley
Ticks and Tick-borne Diseases.2024; 15(6): 102405. CrossRef
Distribution and Prevalence of Anaplasmataceae, Rickettsiaceae and Coxiellaceae in African Ticks: A Systematic Review and Meta-Analysis
Carlo Andrea Cossu, Nicola E. Collins, Marinda C. Oosthuizen, Maria Luisa Menandro, Raksha Vasantrai Bhoora, Ilse Vorster, Rudi Cassini, Hein Stoltsz, Melvyn Quan, Henriette van Heerden
Microorganisms.2023; 11(3): 714. CrossRef
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Agatha Kolo
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Ticks and Tick-Borne Pathogens in Domestic Animals, Wild Pigs, and Off-Host Environmental Sampling in Guam, USA
Genevieve V. Weaver, Neil Anderson, Kayla Garrett, Alec T. Thompson, Michael J. Yabsley
Frontiers in Veterinary Science.2022;[Epub] CrossRef
Epidemiology of Ticks and Tick-Borne Pathogens in Domestic Ruminants across Southern African Development Community (SADC) Region from 1980 until 2021: A Systematic Review and Meta-Analysis
Mpho Tawana, ThankGod E. Onyiche, Tsepo Ramatla, Sibusiso Mtshali, Oriel Thekisoe
Pathogens.2022; 11(8): 929. CrossRef
The diversity and evolutionary relationships of ticks and tick-borne bacteria collected in China
JunHua Tian, Xin Hou, MiHong Ge, HongBin Xu, Bin Yu, Jing Liu, RenFu Shao, Edward C. Holmes, ChaoLiang Lei, Mang Shi
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Richard Hodosi, Maria Kazimirova, Katarina Soltys
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The molecular prevalence, distribution and risk factors associated with Babesia bigemina infection in Peninsular Malaysia
Shola David Ola-Fadunsin, Reuben Sunil Kumar Sharma, Donea Abdurazak Abdullah, Fufa Ido Gimba, Faez Firdaus Jesse Abdullah, Rehana Abdullah Sani
Ticks and Tick-borne Diseases.2021; 12(3): 101653. CrossRef
Prioritizing smallholder animal health needs in East Africa, West Africa, and South Asia using three approaches: Literature review, expert workshops, and practitioner surveys
Zoë Campbell, Paul Coleman, Andrea Guest, Peetambar Kushwaha, Thembinkosi Ramuthivheli, Tom Osebe, Brian Perry, Jeremy Salt
Preventive Veterinary Medicine.2021; 189: 105279. CrossRef
Comparative microbiomes of ticks collected from a black rhino and its surrounding environment
Seogwon Lee, Ju Yeong Kim, Myung-hee Yi, In-Yong Lee, Robert Fyumagwa, Tai-Soon Yong
International Journal for Parasitology: Parasites and Wildlife.2019; 9: 239. CrossRef

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Echinostoma ilocanum Infection in Two Residents of Savannakhet Province, Lao PDR: Jong-Yil Chai, Woon-Mok Sohn, Jaeeun Cho, Keeseon S. Eom, Tai-Soon Yong, Duk-Young Min, Eui-Hyug Hoang, Bounlay Phommasack, Bounnaloth Insisiengmay, Han-Jong Rim; Korean J Parasitol 2018;56(1):75-79.
Published online February 28, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.1.75

Abstract
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Adult specimens of Echinostoma ilocanum (Garrison, 1908) Odhner, 1911 (Trematoda: Echinostomatidae) were recovered from 2 riparian people who resided along the Mekong River in Savannakhet Province, Lao PDR. In fecal examinations done by the Kato-Katz technique, they revealed echinostome eggs together with eggs of Opisthorchis viverrini (and minute intestinal fluke eggs) and hookworms. To recover the adult flukes, they were treated with praziquantel 30-40 mg/kg in a single dose and purged with magnesium salts. A total of 658 adult fluke specimens were recovered from the 2 people; 456 from case 1 and 202 from case 2. Specimens from case 1 consisted of 335 echinostomes (301 E. ilocanum and 34 species undetermined), 120 O. viverrini, and 1 Haplorchis taichui, and those from case 2 consisted of 36 E. ilocanum, 134 O. viverrini, and 32 H. taichui. Thus, the number of E. ilocanum specimens was 337 in total (average per person, 168.5). From this study, it is suggested that foodborne intestinal flukes and liver flukes are highly prevalent along the Mekong River in Savannakhet Province. The present report describes for the first time human infections with E. ilocanum in Lao PDR.

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Development and utilization of a visual loop-mediated isothermal amplification coupled with a lateral flow dipstick (LAMP-LFD) assay for rapid detection of Echinostomatidae metacercaria in edible snail samples
Wasin Panich, Phonkawin Jaruboonyakorn, Awika Raksaman, Thanawan Tejangkura, Thapana Chontananarth
International Journal of Food Microbiology.2024; 418: 110732. CrossRef
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General overview of the current status of human foodborne trematodiasis
Jong-Yil Chai, Bong-Kwang Jung
Parasitology.2022; 149(10): 1262. CrossRef
Foodborne intestinal flukes: A brief review of epidemiology and geographical distribution
Jong-Yil Chai, Bong-Kwang Jung
Acta Tropica.2020; 201: 105210. CrossRef
Echinostoma aegyptica (Trematoda: Echinostomatidae) Infection in Five Riparian People in Savannakhet Province, Lao PDR
Jong-Yil Chai, Bong-Kwang Jung, Taehee Chang, Hyejoo Shin, Woon-Mok Sohn, Keeseon S. Eom, Tai-Soon Yong, Duk-Young Min, Bounlay Phammasack, Bounnaloth Insisiengmay, Han-Jong Rim
The Korean Journal of Parasitology.2020; 58(1): 67. CrossRef
Echinostoma mekongi n. sp. (Digenea: Echinostomatidae) from Riparian People along the Mekong River in Cambodia
Jaeeun Cho, Bong-Kwang Jung, Taehee Chang, Woon-Mok Sohn, Muth Sinuon, Jong-Yil Chai
The Korean Journal of Parasitology.2020; 58(4): 431. CrossRef
Echinochasmus caninus n. comb. (Trematoda: Echinostomatidae) Infection in Eleven Riparian People in Khammouane Province, Lao PDR
Jong-Yil Chai, Taehee Chang, Bong-Kwang Jung, Hyejoo Shin, Woon-Mok Sohn, Keeseon S. Eom, Tai-Soon Yong, Duk-Young Min, Bounlay Phammasack, Bounnaloth Insisiengmay, Han-Jong Rim
The Korean Journal of Parasitology.2019; 57(4): 451. CrossRef

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Case Report

A Case of Pentastomiasis at the Left Maxilla Bone in a Patient with Thyroid Cancer: Eunae Sandra Cho, Seung Wook Jung, Hwi-Dong Jung, In Yong Lee, Tai-Soon Yong, Su Jin Jeong, Hyun Sil Kim; Korean J Parasitol 2017;55(4):433-437.
Published online August 31, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.4.433

Abstract
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Pentastomiasis, a zoonotic parasite infection, is typically found in the respiratory tract and viscera of the host, including humans. Here, we report for the first time an extremely rare case of intraosseous pentastomiasis in the human maxilla suffering from medication related osteonecrosis of the jaw (MRONJ). A 55-year-old male had continuously visited the hospital for MRONJ which had primarily developed after bisphosphonate and anti-neoplastic administration for previous bone metastasis of medullary thyroid cancer. Pain, bone exposure, and pus discharge in the right mandible and left maxilla were seen. Osteolysis with maxillary cortical bone perforation at the left buccal vestibule, palate, nasal cavity, and maxillary sinus was observed by radiologic images. A biopsy was done at the left maxilla and through pathological evaluation, a parasite with features of pentastome was revealed within the necrotic bone tissue. Further history taking and laboratory evaluation was done. The parasite was suspected to be infected through maxillary open wounds caused by MRONJ. Awareness of intraosseous pentastomiasis should be emphasized not to be missed behind the MRONJ. Proper evaluation and interpretation for past medical history may lead to correct differential diagnosis and therapeutic intervention for parasite infections.

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Medication-Related Osteonecrosis of the Jaw: A Systematic Review of Case Reports and Case Series
Filipa Frutuoso, Filipe Freitas, Miguel Vilares, Helena Francisco, Duarte Marques, João Caramês, André Moreira
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Niccolò Fonti, Francesca Parisi, Francesca Mancianti, Giulia Freer, Alessandro Poli
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Brief Communications

Artyfechinostomum malayanum: Metacercariae Encysted in Pila sp. Snails Purchased from Phnom Penh, Cambodia: Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Muth Sinuon, Hoo-Gn Jeoung, Jong-Yil Chai; Korean J Parasitol 2017;55(3):341-345.
Published online June 30, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.3.341

Abstract
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The metacercariae of Artyfechinostomum malayanum (Leiper, 1911) Mendheim, 1943 were discovered in Pila sp. snails purchased from a market in Phnom Penh, Cambodia. They were isolated from the snails using the artificial digestion technique and were orally fed to 2 hamsters, 1 rat, and 2 mice to obtain the adult flukes. The metacercariae were round, 145-165 μm in diameter, having a cyst wall of 6-10 μm in thickness, a head collar and collar spines, and characteristic features of excretory granules. Adult flukes were recovered in the small intestines of the animals at days 14 and 32 post infection and were morphologically observed using a light microscope and a scanning electron microscope. They were plump or elongated, ventrally curved, 6.0-8.1×1.6-2.0 mm in size, and characterized by the head collar bearing 43 collar spines, including 5 end group ones on each side, a long cirrus sac extending beyond the posterior margin of the ventral sucker, a submedian ovary, and 2 deeply lobed testes. Eggs in uteri were operculate, ovoid to ellipsoid, and 120-135×68-75 μm in size. In scanning electron microscopy, the head collar was prominent with collar spines looking like horns. Scale-like tegumental spines were densely distributed on the ventral surface between the head collar and ventral sucker. Sensory papillae were distributed mainly on the tegument around suckers. By this study, it has been first confirmed that the life cycle of A. malayanum exists in Cambodia.

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The ribosomal transcription units of five echinostomes and their taxonomic implications for the suborder Echinostomata (Trematoda: Platyhelminthes)
Thanh Hoa Le, Linh Thi Khanh Pham, Dong Van Quyen, Khue Thi Nguyen, Huong Thi Thanh Doan, Weerachai Saijuntha, David Blair
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International Journal of Environmental Research and Public Health.2024; 21(12): 1621. CrossRef
Mitophylogenomics of the zoonotic fluke Echinostoma malayanum confirms it as a member of the genus Artyfechinostomum Lane, 1915 and illustrates the complexity of Echinostomatidae systematics
Linh Thi Khanh Pham, Weerachai Saijuntha, Scott P. Lawton, Thanh Hoa Le
Parasitology Research.2022; 121(3): 899. CrossRef
High diversity of trematode metacercariae that parasitize freshwater gastropods in Bangkok, Thailand, and their infective situations, morphologies and phylogenetic relationships
Pichit Wiroonpan, Thapana Chontananarth, Jong-Yil Chai, Watchariya Purivirojkul
Parasitology.2022; 149(7): 913. CrossRef
General overview of the current status of human foodborne trematodiasis
Jong-Yil Chai, Bong-Kwang Jung
Parasitology.2022; 149(10): 1262. CrossRef
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Jong-Yil Chai, Bong-Kwang Jung
Acta Tropica.2020; 201: 105210. CrossRef

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Indoor Occurrence of the Ghost Ant Tapinoma melanocephalum (Hymenoptera: Formicidae) in Urban Homes in Korea: In Yong Lee, Seong Joon Park, Jang Hoon Seo, Seobo Sim, Jin-Hwan Kim, Young Gon Gwon, Tai-Soon Yong; Korean J Parasitol 2017;55(2):225-228.
Published online April 30, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.2.225

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The ghost ant Tapinoma melanocephalum is a common household pest worldwide. The present study examined the occurrence of the species in urban homes in Korea. During the period of September 2014 to January 2016, T. melanocephalum workers were collected from 58 homes at 29 different localities using bait traps with 10% sugar solution. The species was widely distributed throughout urban homes at 29 different localities, and the indoor occurrence of T. melanocephalum was highest in Seoul (32.7%) and metropolitan areas of Gyeonggi-do (Province) (29.3%). The indoor incidence rate of T. melanocephalum peaked in September (22.8%), remained moderate from October through April, and peaked again in May (15.7%). In contrast, a low incidence was observed from June to August (7.0%). The present study provides evidence that native ants, such as T. melanocephalum, are potential indoor pests of homes in Korea throughout the year.

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Ant invasion in China: An in-depth analysis of the country's ongoing battle with exotic ants
Junaid Ali Siddiqui, Bamisope Steve Bamisile, Ruidong Fan, Muhammad Hafeez, Waqar Islam, Wenjia Yang, Minyi Wei, Hao Ran, Yijuan Xu, Xiaoyulong Chen
Ecological Indicators.2024; 160: 111811. CrossRef
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Yijuan Xu, Edward L. Vargo, Kazuki Tsuji, Ross Wylie
Annual Review of Entomology.2022; 67(1): 27. CrossRef

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IN MEMORIAM Professor Chin-Thack Soh (1921-2016): Tai-Soon Yong; Korean J Parasitol 2016;54(6):819-819.
Published online December 31, 2016; DOI: https://doi.org/10.3347/kjp.2016.54.6.819

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Articles from Symposium on Controls of NTDs around Lake Victoria, Tanzania

High Malaria Prevalence among Schoolchildren on Kome Island, Tanzania: Min-Jae Kim, Bong-Kwang Jung, Jong-Yil Chai, Keeseon S. Eom, Tai-Soon Yong, Duk-Young Min, Julius E. Siza, Godfrey M. Kaatano, Josephat Kuboza, Peter Mnyeshi, John M. Changalucha, Yunsuk Ko, Su Young Chang, Han-Jong Rim; Korean J Parasitol 2015;53(5):571-574.
Published online October 29, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.5.571

Abstract
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In order to determine the status of malaria among schoolchildren on Kome Island (Lake Victoria), near Mwanza, Tanzania, a total of 244 schoolchildren in 10 primary schools were subjected to a blood survey using the fingerprick method. The subjected schoolchildren were 123 boys and 121 girls who were 6-8 years of age. Only 1 blood smear was prepared for each child. The overall prevalence of malaria was 38.1% (93 positives), and sex difference was not remarkable. However, the positive rate was the highest in Izindabo Primary School (51.4%) followed by Isenyi Primary School (48.3%) and Bugoro Primary School (46.7%). The lowest prevalence was found in Muungano Primary School (16.7%) and Nyamiswi Primary School (16.7%). These differences were highly correlated with the location of the school on the Island; those located in the peripheral area revealed higher prevalences while those located in the central area showed lower prevalences. Plasmodium falciparum was the predominant species (38.1%; 93/244), with a small proportion of them mixed-infected with Plasmodium vivax (1.6%; 4/244). The results revealed that malaria is highly prevalent among primary schoolchildren on Kome Island, Tanzania, and there is an urgent need to control malaria in this area.

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Improved Perceptions and Practices Related to Schistosomiasis and Intestinal Worm Infections Following PHAST Intervention on Kome Island, North-Western Tanzania: Joseph R. Mwanga, Godfrey M. Kaatano, Julius E. Siza, Su Young Chang, Yunsuk Ko, Cyril M. Kullaya, Jackson Nsabo, Keeseon S. Eom, Tai-Soon Yong, Jong-Yil Chai, Duk-Young Min, Han-Jong Rim, John M. Changalucha; Korean J Parasitol 2015;53(5):561-569.
Published online October 29, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.5.561

Abstract
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Schistosomiasis and intestinal worm infections are widespread diseases of public health importance in Tanzania. A study on perceptions and practices related to schistosomiasis and intestinal worm infections was undertaken among a community population of Kome Island in Sengerema District, north-western Tanzania, where intestinal schistosomiasis and intestinal worm infections are endemic. Schistosomiasis and intestinal worm-related perceptions and practices were assessed before and 3 years after implementation of a participatory hygiene and sanitation transformation (PHAST) intervention as a control measure. Data were obtained from baseline and post-intervention knowledge, attitudes, and practices (KAP) questionnaire surveys conducted twice in 2009 and 2012 among 82 individuals aged ≥15 years. We found significant increases in respondents’ knowledge of the cause, transmission, symptoms, health consequences, and prevention of schistosomiasis and intestinal worm infections after PHAST intervention. The increase in respondents’ knowledge on almost all aspects of the said infections was translated into actions to control schistosomiasis and intestinal worm infections. This has not been achieved by chance, but due to well-designed and locally-adapted PHAST intervention. We conclude that despite criticisms, PHAST approach is still useful in empowering communities to control water, sanitation, and hygiene related infectious diseases such as schistosomiasis and intestinal worm infections.

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Integrated Schistosomiasis and Soil-Transmitted Helminthiasis Control over Five Years on Kome Island, Tanzania
Godfrey M. Kaatano, Julius E. Siza, Joseph R. Mwanga, Duk-Yong Min, Tai-Soon Yong, Jong-Yil Chai, Yunsuk Ko, Su Young Chang, Cyril M. Kullaya, Han-Jong Rim, John M. Changalucha, Keeseon S. Eom
The Korean Journal of Parasitology.2015; 53(5): 535. CrossRef

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Improved Socio-Economic Status of a Community Population Following Schistosomiasis and Intestinal Worm Control Interventions on Kome Island, North-Western Tanzania: Joseph R. Mwanga, Godfrey M. Kaatano, Julius E. Siza, Su Young Chang, Yunsuk Ko, Cyril M. Kullaya, Jackson Nsabo, Keeseon S. Eom, Tai-Soon Yong, Jong-Yil Chai, Duk-Young Min, Han-Jong Rim, John M. Changalucha; Korean J Parasitol 2015;53(5):553-559.
Published online October 29, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.5.553

Abstract
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Research on micro-level assessment of the changes of socio-economic status following health interventions is very scarce. The use of household asset data to determine wealth indices is a common procedure for estimating socio-economic position in resource poor settings. In such settings information about income is usually lacking, and the collection of individual consumption or expenditure data would require in-depth interviews, posing a considerable risk of bias. In this study, we determined the socio-economic status of 213 households in a community population in an island in the north-western Tanzania before and 3 year after implementation of a participatory hygiene and sanitation transformation (PHAST) intervention to control schistosomiasis and intestinal worm infections. We constructed a household 'wealth index' based housing construction features (e.g., type of roof, walls, and floor) and durable assets ownership (e.g., bicycle, radio, etc.). We employed principal components analysis and classified households into wealth quintiles. The study revealed that asset variables with positive factor scores were associated with higher socio-economic status, whereas asset variables with negative factor scores were associated with lower socio-economic status. Overall, households which were rated as the poorest and very poor were on the decrease, whereas those rated as poor, less poor, and the least poor were on the increase after PHAST intervention. This decrease/increase was significant. The median shifted from -0.4376677 to 0.5001073, and the mean from -0.2605787 (SD; 2.005688) to 0.2605787 (SD; 1.831199). The difference in socio-economic status of the people between the 2 phases was highly statistically significant (P<0.001). We argue that finding of this study should be treated with caution as there were other interventions to control schistosomiasis and intestinal worm infections which were running concurrently on Kome Island apart from PHAST intervention.

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Schistosoma mansoni-Related Hepatosplenic Morbidity in Adult Population on Kome Island, Sengerema District, Tanzania: Godfrey M. Kaatano, Duk-Young Min, Julius E. Siza, Tai-Soon Yong, Jong-Yil Chai, Yunsuk Ko, Su-Young Chang, John M. Changalucha, Keeseon S. Eom, Han-Jong Rim; Korean J Parasitol 2015;53(5):545-551.
Published online October 29, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.5.545

Abstract
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Schistosomiasis is one of the important neglected tropical diseases (NTDs) in Tanzania, particularly in Lake Victoria zone. This baseline survey was a part of the main study of integrated control of schistosomiasis and soil-transmitted helminths (STHs) aimed at describing morbidity patterns due to intestinal schistosomiasis among adults living on Kome Island, Sengerema District, Tanzania. Total 388 adults from Kome Islands (about 50 people from each village) aged between 12 and 85 years, were examined by abdominal ultrasound according to the Niamey protocol. Liver image patterns (LIPs) A and B were considered normal, and C-F as distinct periportal fibrosis (PPF). The overall prevalence of PPF was 42.2%; much higher in males than in females (47.0% in male vs 34.4% in females, P=0.007). Abnormal increase of segmental branch wall thickness (SBWT) and dilated portal vein diameter (PVD) were also more common in males than in females. Hepatosplenomegaly was frequently encountered; 68.1% had left liver lobe hepatomegaly and 55.2% had splenomegaly. Schistosoma mansoni-related morbidity is quite high among adults in this community justifying the implementation of integrated control strategies through mass drug administration, improved water supply (pumped wells), and health education that had already started in the study area.

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Integrated Schistosomiasis and Soil-Transmitted Helminthiasis Control over Five Years on Kome Island, Tanzania: Godfrey M. Kaatano, Julius E. Siza, Joseph R. Mwanga, Duk-Yong Min, Tai-Soon Yong, Jong-Yil Chai, Yunsuk Ko, Su Young Chang, Cyril M. Kullaya, Han-Jong Rim, John M. Changalucha, Keeseon S. Eom; Korean J Parasitol 2015;53(5):535-543.
Published online October 29, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.5.535

Abstract
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Integrated control strategies are important for sustainable control of schistosomiasis and soil-transmitted helminthiasis, despite their challenges for their effective implementation. With the support of Good Neighbors International in collaboration with National Institute of Medical Research, Mwanza, Tanzania, integrated control applying mass drug administration (MDA), health education using PHAST, and improved safe water supply has been implemented on Kome Island over 5 years for controlling schistosomiasis and soil-transmitted helminths (STHs). Baseline surveys for schistosomiasis and STHs was conducted before implementation of any integrated control strategies, followed by 4 cross-sectional follow-up surveys on randomly selected samples of schoolchildren and adults in 10 primary schools and 8 villages, respectively, on Kome islands. Those follow-up surveys were conducted for impact evaluation after introduction of control strategies interventions in the study area. Five rounds of MDA have been implemented from 2009 along with PHAST and improved water supply with pumped wells as other control strategies for complementing MDA. A remarkable steady decline of schistosomiasis and STHs was observed from 2009 to 2012 with significant trends in their prevalence decline, and thereafter infection rate has remained at a low sustainable control. By the third follow-up survey in 2012, Schistosoma mansoni infection prevalence was reduced by 90.5% and hookworm by 93.3% among schoolchildren while in adults the corresponding reduction was 83.2% and 56.9%, respectively. Integrated control strategies have successfully reduced S. mansoni and STH infection status to a lower level. This study further suggests that monitoring and evaluation is a crucial component of any large-scale STH and schistosomiasis intervention.

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Prevalence of Schistosomes and Soil-Transmitted Helminths and Morbidity Associated with Schistosomiasis among Adult Population in Lake Victoria Basin, Tanzania: Julius E. Siza, Godfrey M. Kaatano, Jong-Yil Chai, Keeseon S. Eom, Han-Jong Rim, Tai-Soon Yong, Duk-Young Min, Su Young Chang, Yunsuk Ko, John M. Changalucha; Korean J Parasitol 2015;53(5):525-533.
Published online October 29, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.5.525

Abstract
PDF

The
objective
of this study was to carry out a community survey on schistosomiais and soil-transmitted helminth (STH) infections in order to suggest feasible and effective intervention strategies in Lake Victoria basin, Tanzania. A total of 37 communities selected from 23 districts of the 4 regions in the Lake Victoria basin of Tanzania were involved in the study. From each of the selected locality, 50 adult community members, 25 males and 25 females, were recruited for the study. Each study participant was requested to submit stool and urine specimens. From each stool specimen, duplicate Kato-Katz thick smears were prepared and microscopically examined for Schistosoma mansoni and STH eggs. Urine specimens were processed by the filtration technique and microscopically examined for Schistosoma haematobium eggs. Ultrasound examination for morbidity due to schistosomiasis was performed. Mass treatment was done using praziquantel and albendazole for schistosome and STHs infections, respectively. Out of 1,606 adults who provided stool specimens, 199 (12.4%) were positive for S. mansoni, 349 (21.7%) for hookworms, 133 (8.3%) for Ascaris lumbricoides, and 33 (2.0%) for Trichuris trichiura. Out of 1,400 participants who provided urine specimens, 25 (1.8%) were positive for S. haematobium eggs. Because of the co-endemicity of these afflictions and their impact on vulnerable population groups, the helminthiasis could be simultaneously treated with 2 drugs, praziquantel for schistosomiasis and albendazole for STHs.

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Prevalence of Schistosomes and Soil-Transmitted Helminths among Schoolchildren in Lake Victoria Basin, Tanzania: Julius E. Siza, Godfrey M. Kaatano, Jong-Yil Chai, Keeseon S. Eom, Han-Jong Rim, Tai-Soon Yong, Duk-Young Min, Su Young Chang, Yunsuk Ko, John M. Changalucha; Korean J Parasitol 2015;53(5):515-524.
Published online October 29, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.5.515

Abstract
PDF

The
objective
s of this study was to conduct a survey on schistosomiasis and soil-transmitted helminth (STH) infections in order to come up with feasible control strategies in Lake Victoria basin, Tanzania. Depending on the size of the school, 150-200 schoolchildren were recruited for the study. Duplicate Kato-Katz stool smears were prepared from each child and microscopically examined for Schistosoma mansoni and STHs. Urine specimens were examined for Schistosoma haematobium eggs using the filtration technique. After the survey, mass drug administration was done using praziquantel and albendazole for schistosomiasis and STHs infections, respectively. A total of 5,952 schoolchildren from 36 schools were recruited for the study and had their stool and urine specimens examined. Out of 5,952 schoolchildren, 898 (15.1%) were positive for S. mansoni, 754 (12.6%) for hookworms, 188 (3.2%) for Ascaris lumblicoides, and 5 (0.008%) for Trichuris trichiura. Out of 5,826 schoolchildren who provided urine samples, 519 (8.9%) were positive for S. haematobium eggs. The results revealed that intestinal schistosomiasis, urogenital schistosomiasis, and STH infections are highly prevalent throughought the lake basin. The high prevalence of intestinal and urogenital schistosomisiasis in the study area was a function of the distance from Lake Victoria, the former being more prevalent at localities close to the lake, whilst the latter is more so away from it. Control of schistosomiasis and STHs in the study area requires an integrated strategy that involves provision of health education to communities, regular treatments, and provision of adequate safe water supply and sanitation facilities.

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Original Articles

Infection Status of Zoonotic Trematode Metacercariae in Fishes from Vientiane Municipality and Champasak Province in Lao PDR: Keeseon S. Eom, Han-Sol Park, Dongmin Lee, Woon-Mok Sohn, Tai-Soon Yong, Jong-Yil Chai, Duk-Young Min, Han-Jong Rim, Bounnaloth Insisiengmay, Bounlay Phommasack; Korean J Parasitol 2015;53(4):447-453.
Published online August 25, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.4.447

Abstract
PDF

The infection status of fishborne zoonotic trematode (FZT) metacercariae was investigated in fishes from 2 localities of Lao PDR. Total 157 freshwater fishes (17 species) were collected in local markets of Vientiane Municipality and Champasak Province in December 2010 and July 2011, and each fish was examined by the artificial digestion method. Total 6 species of FZT metacercariae, i.e., Opisthorchis viverrini, Haplorchis taichui, Haplorchis yokogawai, Haplorchis pumilio, Centrocestus formosanus, and Procerovum varium, were detected in fishes from Vientiane Municipality. The metacercariae of O. viverrini were detected in 50 (49.5%) out of 101 fishes (6 species), and their average number was 154 per fish infected. The remaining 5 species of heterophyid metacercariae were detected in 36.8%, 65.8%, 9.4%, 23.9%, and 5.1% fishes examined, and their average densities were 12, 1,038, 4, 15, and 13 per infected fish, respectively. In fishes from Champasak Province, 3 species of FZT metacercariae, i.e., O. viverrini, H. taichui, and H. yokogawai, were detected. Only 2 O. viverrini metacercariae were found in only 1 Barbonymus schwanefeldi. The metacercariae of H. taichui and H. yokogawai were detected in 60.0% and 50.0% of fishes examined, and their average densities were 47 and 28 per fish infected. By the present study, it has been confirmed that several species of FZT metacercariae are prevalent in fishes from Vientiane Municipality, with P. varium being a new member of FZT in Lao PDR. In comparison, FZT metacercariae are less prevalent in fishes from Champasak Province.

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Zoonotic Trematode Metacercariae in Fish from Yangon, Myanmar and Their Adults Recovered from Experimental Animals
Jong-Yil Chai, Woon-Mok Sohn, Byoung-Kuk Na, Jong-Bok Park, Hoo-Gn Jeoung, Eui-Hyug Hoang, Thi Thi Htoon, Htay Htay Tin
The Korean Journal of Parasitology.2017; 55(6): 631. CrossRef

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Intestinal Helminths Recovered from Humans in Xieng Khouang Province, Lao PDR with a Particular Note on Haplorchis pumilio Infection: Jong-Yil Chai, Woon-Mok Sohn, Bong-Kwang Jung, Tai-Soon Yong, Keeseon S. Eom, Duk-Young Min, Bounnaloth Insisiengmay, Sithat Insisiengmay, Bounlay Phommasack, Han-Jong Rim; Korean J Parasitol 2015;53(4):439-445.
Published online August 25, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.4.439

Abstract
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A survey of intestinal helminths was undertaken in riparian people in Xieng Khouang Province, Lao PDR. Fecal specimens were collected from 643 people (289 males and 354 females) residing in 4 districts (Nonghet, Kham, Phoukout, and Pek) and were examined by the Kato-Katz technique. The overall helminth egg positive rate was 41.2%, and hookworms revealed the highest prevalence (32.7%) followed by Trichuris trichiura (7.3%) and Ascaris lumbricoides (5.6%). The positive rate for small trematode eggs (STE), which may include Opisthorchis viverrini, heterophyids, and lecithodendriids, was 4.4%. For recovery of adult helminths, 12 STE or nematode/cestode egg-positive people were treated with 40 mg/kg praziquantel and 15 mg/kg pyrantel pamoate, and then purged. Mixed infections with 2 Haplorchis species (H. pumilio and H. taichui), Centrocestus formosanus, Opisthorchis viverrini, a species of cestode (Taenia saginata), and several species of nematodes including hookworms and Enterobius vermicularis were detected. The worm load for trematodes was the highest for H. pumilio with an average of 283.5 specimens per infected person followed by C. formosanus, H. taichui, and O. viverrini. The worm load for nematodes was the highest for hookworms (21.5/infected case) followed by E. vermicularis (3.2/infected case). The results revealed that the surveyed areas of Xieng Khouang Province, Lao PDR are endemic areas of various species of intestinal helminths. The STE found in the surveyed population were verified to be those of heterophyids, particularly H. pumilio.

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Genetic Diversity of Schistosoma haematobium Eggs Isolated from Human Urine in Sudan: Juan-Hua Quan, In-Wook Choi, Hassan Ahmed Hassan Ahmed Ismail, Abdoelohab Saed Mohamed, Hoo-Gn Jeong, Jin-Su Lee, Sung-Tae Hong, Tai-Soon Yong, Guang-Ho Cha, Young-Ha Lee; Korean J Parasitol 2015;53(3):271-277.
Published online June 30, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.3.271

Abstract
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The genetic diversity of Schistosoma haematobium remains largely unstudied in comparison to that of Schistosoma mansoni. To characterize the extent of genetic diversity in S. haematobium among its definitive host (humans), we collected S. haematobium eggs from the urine of 73 infected schoolchildren at 5 primary schools in White Nile State, Sudan, and then performed a randomly amplified polymorphic DNA marker ITS2 by PCR-RFLP analysis. Among 73 S. haematobium egg-positive cases, 13 were selected based on the presence of the S. haematobium satellite markers A4 and B2 in their genomic DNA, and used for RFLP analysis. The 13 samples were subjected to an RFLP analysis of the S. haematobium ITS2 region; however, there was no variation in size among the fragments. Compared to the ITS2 sequences obtained for S. haematobium from Kenya, the nucleotide sequences of the ITS2 regions of S. haematobium from 4 areas in Sudan were consistent with those from Kenya (> 99%). In this study, we demonstrate for the first time that most of the S. haematobium population in Sudan consists of a pan-African S. haematobium genotype; however, we also report the discovery of Kenyan strain inflow into White Nile, Sudan.

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Case Report

Human Sting of Cephalonomia gallicola (Hymenoptera: Bethylidae) in Korea: In-Yong Lee, Chang-Seob Shin, Seobo Sim, Jung-Won Park, Tai-Soon Yong; Korean J Parasitol 2014;52(6):681-684.
Published online December 23, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.6.681

Abstract
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Hymenoptera stings can cause serious injury to humans. We report the clinical findings of 6 cases of Hymenoptera stings. All patients developed painful erythematous papules at the sting sites and had a past history of parasitoid wasp sting. This is the first clinical report of the parasitoid wasp, Cephalonomia gallicola, causing human stings in Korea.

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Original Article

Prevalence of Intestinal Helminths among Inhabitants of Cambodia (2006-2011): Tai-Soon Yong, Jong-Yil Chai, Woon-Mok Sohn, Keeseon S. Eom, Hoo-Gn Jeoung, Eui-Hyug Hoang, Cheong-Ha Yoon, Bong-Kwang Jung, Soon-Hyung Lee, Muth Sinuon, Duong Socheat; Korean J Parasitol 2014;52(6):661-666.
Published online December 23, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.6.661

Abstract
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In order to investigate the status of intestinal helminthic infections in Cambodia, epidemiological surveys were carried out on a national scale, including 19 provinces. A total of 32,201 fecal samples were collected from schoolchildren and adults between 2006 and 2011 and examined once by the Kato-Katz thick smear technique. The overall egg positive rate of intestinal helminths was 26.2%. The prevalence of hookworms was the highest (9.6%), followed by that of Opisthorchis viverrini/minute intestinal flukes (Ov/MIF) (5.7%), Ascaris lumbricoides (4.6%), and Trichuris trichiura (4.1%). Other types of parasites detected were Enterobius vermicularis (1.1%), Taenia spp. (0.4%), and Hymenolepis spp. (0.2%). The northwestern regions such as the Siem Reap, Oddar Meanchey, and Banteay Meanchey Provinces showed higher prevalences (17.4-22.3%) of hookworms than the other localities. The southwestern areas, including Koh Kong and Preah Sihanouk Provinces showed higher prevalences of A. lumbricoides (17.5-19.2%) and T. trichiura (6.1-21.0%). Meanwhile, the central and southern areas, in particular, Takeo and Kampong Cham Provinces, showed high prevalences of Ov/MIF (23.8-24.0%). The results indicate that a considerably high prevalence of intestinal helminths has been revealed in Cambodia, and thus sustained national parasite control projects are necessary to reduce morbidity due to parasitic infections in Cambodia.

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Brief Communications

Ixodid Tick Infestation in Cattle and Wild Animals in Maswa and Iringa, Tanzania: You Shine Kwak, Tae Yun Kim, Sung-Hyun Nam, In-Yong Lee, Hyung-Pyo Kim, Simon Mduma, Julius Keyyu, Robert Fyumagwa, Tai-Soon Yong; Korean J Parasitol 2014;52(5):565-568.
Published online October 22, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.5.565

Abstract
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Ticks and tick-borne diseases are important in human and livestock health worldwide. In November 2012, ixodid ticks were collected and identified morphologically from cattle and wild animals in the Maswa district and Iringa urban, Tanzania. Amblyomma gemma, A. lepidum, and A. variegatum were identified from Maswa cattle, and A. variegatum was the predominant species. A. marmoreum, Hyalomma impeltatum, and Rhipicephalus pulchellus were identified from Iringa cattle in addition to the above 3 Amblyomma species, and A. gemma was the most abundant species. Total 4 Amblyomma and 6 Rhipicephalus species were identified from wild animals of the 2 areas. A. lepidum was predominant in Maswa buffaloes, whereas A. gemma was predominant in Iringa buffaloes. Overall, A. variegatum in cattle was predominant in the Maswa district and A. gemma was predominant in Iringa, Tanzania.

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Karyological Studies of Biomphalaria tenagophila (d'Orbigny, 1835) (Gastropoda: Planobidae) from Rio de Janeiro, Brazil: Gab Man Park, Tai-Soon Yong; Korean J Parasitol 2014;52(4):449-451.
Published online August 29, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.4.449

Abstract
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The karyotypes of Biomphalaria tenagophila collected from Rio de Janeiro, Brazil were studied using the air-drying method. Somatic cells of this species had 2n=36. The 18 chromosome pairs were identified and classified into 3 groups. The diploid cell has 7 pairs of metacentric, 8 pairs of submetacentric, and 3 pairs of subtelocentric chromosomes. Observed chromosomes ranged from 2.4 to 6.4 ?m, and the total length was 122.3 ?m. This is the first report on the chromosome of B. tenagophila.

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Original Articles

Prevalence of Helminthic Infections among Inhabitants of Lao PDR: Keeseon S. Eom, Tai-Soon Yong, Woon-Mok Sohn, Jong-Yil Chai, Duk-Young Min, Han-Jong Rim, Hyeong-Kyu Jeon, Virasack Banouvong, Bounnaloth Insisiengmay, Bounlay Phommasack; Korean J Parasitol 2014;52(1):51-56.
Published online February 19, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.1.51

Abstract
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The prevalence of helminthic infections was surveyed on a total of 6,178 residents (males 2,549 and females 3,629) in 102 villages of 9 provinces in Lao PDR between 2007 and 2011 under the project of Korea-Laos Collaborative Project for Control of Foodborne Trematode Infections in Lao PDR. Fecal specimens were collected and examined by the Kato-Katz thick smear and Stoll's egg counting techniques. The overall liver/intestinal helminth egg positive rate was 71.9% with a single or mixed infections with Opisthorchis viverrini and minute intestinal flukes (Ov/MIF), Ascaris lumbricoides, hookworms, Trichuris trichiura, Trichostrongylus sp., echinostomes, Taenia spp., and others. Ov/MIF revealed the highest prevalence (55.6%) followed by hookworms (27.8%) and T. trichiura (6.5%). The endemic regions with the highest prevalence of Ov/MIF were Savannakhet, Khammouane, Vientiane (Nam Ngum), Champasak (Khong Island), and Saravane Province. High prevalences of A. lumbricoides (33.8%), hookworms (47.8%), and T. trichiura (32.6%) were observed in Phongsaly, Luang Prabang, and Vientiane (Nam Ngum) areas, respectively. The results of this study highlight helminth parasites of current public health significance in different areas of Lao PDR.

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Jong-Yil Chai, Soon-Hyung Lee, Han-Jong Rim, Woon-Mok Sohn, Bounlay Phommasack
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Ultrasonographic investigation of cholangiocarcinoma in Lao PDR
Ju Yeong Kim, Tai-Soon Yong, Han-Jong Rim, Jong-Yil Chai, Duk-Young Min, Keeseon S. Eom, Woon-Mok Sohn, Jae Hoon Lim, Dongil Choi, Sithat Insisiengmay, Bounlay Phommasack, Bounnaloth Insisiengmay
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Zoonotic Trematode Metacercariae in Fish from Phnom Penh and Pursat, Cambodia: Jong-Yil Chai, Woon-Mok Sohn, Byoung-Kuk Na, Tai-Soon Yong, Keeseon S. Eom, Cheong-Ha Yoon, Eui-Hyug Hoang, Hoo-Gn Jeoung, Duong Socheat; Korean J Parasitol 2014;52(1):35-40.
Published online February 19, 2014; DOI: https://doi.org/10.3347/kjp.2014.52.1.35

Abstract
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A survey was performed to investigate the infection status of freshwater fish with zoonotic trematode metacercariae in Phnom Penh and Pursat Province, Cambodia. All collected fish with ice were transferred to our laboratory and examined using the artificial digestion method. In fish from Phnom Penh, 2 kinds of metacercariae (Opisthorchis viverrini and Haplorchis yokogawai) were detected. O. viverrini metacercariae were positive in 37 (50.0%) of 74 fish in 11 species (average no. metacercariae/fish, 18.6). H. yokogawai metacercariae were detected in 23 (57.5%) of 40 fish in 5 species (average no. metacercariae/fish, 21.0). In fish from Pursat Province, 5 kinds of metacercariae (O. viverrini, H. yokogawai, Haplorchis pumilio, Centrocestus formosanus, and Procerovum sp.) were detected; O. viverrini metacercariae (n=3) in 2 fish species (Henicorhynchus lineatus and Puntioplites falcifer), H. yokogawai metacercariae (n=51) in 1 species (P. falcifer), H. pumilio metacercariae (n=476) in 2 species (H. lineatus and Pristolepis fasciata), C. formosanus metacercariae (n=1) in 1 species (H. lineatus), and Procerovum sp. metacercariae (n=63) in 1 species (Anabas testudineus). From the above results, it has been confirmed that various freshwater fish play the role of a second intermediate host for zoonotic trematodes (O. viverrini, H. yokogawai, H. pumilio, C. formosanus, and Procerovum sp.) in Cambodia.

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The Korean Journal of Parasitology.2015; 53(4): 447. CrossRef

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Complete Mitochondrial Genome of Haplorchis taichui and Comparative Analysis with Other Trematodes: Dongmin Lee, Seongjun Choe, Hansol Park, Hyeong-Kyu Jeon, Jong-Yil Chai, Woon-Mok Sohn, Tai-Soon Yong, Duk-Young Min, Han-Jong Rim, Keeseon S. Eom; Korean J Parasitol 2013;51(6):719-726.
Published online December 31, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.6.719

Abstract
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Mitochondrial genomes have been extensively studied for phylogenetic purposes and to investigate intra- and interspecific genetic variations. In recent years, numerous groups have undertaken sequencing of platyhelminth mitochondrial genomes. Haplorchis taichui (family Heterophyidae) is a trematode that infects humans and animals mainly in Asia, including the Mekong River basin. We sequenced and determined the organization of the complete mitochondrial genome of H. taichui. The mitochondrial genome is 15,130 bp long, containing 12 protein-coding genes, 2 ribosomal RNAs (rRNAs, a small and a large subunit), and 22 transfer RNAs (tRNAs). Like other trematodes, it does not encode the atp8 gene. All genes are transcribed from the same strand. The ATG initiation codon is used for 9 protein-coding genes, and GTG for the remaining 3 (nad1, nad4, and nad5). The mitochondrial genome of H. taichui has a single long non-coding region between trnE and trnG. H. taichui has evolved as being more closely related to Opisthorchiidae than other trematode groups with maximal support in the phylogenetic analysis. Our results could provide a resource for the comparative mitochondrial genome analysis of trematodes, and may yield genetic markers for molecular epidemiological investigations into intestinal flukes.

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Brief Communication

Human Neurocysticercosis Case and an Endemic Focus of Taenia solium in Lao PDR: Hyeong-Kyu Jeon, Tai-Soon Yong, Woon-Mok Sohn, Jong-Yil Chai, Duk-Young Min, Han-Jong Rim, Bounnaloth Insisiengmay, Keeseon S. Eom; Korean J Parasitol 2013;51(5):599-602.
Published online October 31, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.5.599

Abstract
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A male patient with neurocysticercosis was identified in Montai Village, Xay District, Oudomxay Province, Lao PDR in February 2004. He had a history of diagnosis for neurocysticercosis by a CT scan in Thailand after an onset of epileptic seizure in 1993. A pig in the same district was found to contain Taenia solium metacestodes (=cysticerci); the slaughtered pig body contained more than 2,000 cysticerci. In addition to morphological identification, molecular identification was also performed on the cysticerci by DNA sequencing analysis of the mitochondrial cox1 gene; they were confirmed as T. solium metacestodes. The patient is regarded as an indigenous case of neurocysticercosis infected in an endemic focus of T. solium taeniasis/cysticercosis in Oudomxay Province, Lao PDR.

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Original Article

Hyperendemicity of Haplorchis taichui Infection among Riparian People in Saravane and Champasak Province, Lao PDR: Jong-Yil Chai, Tai-Soon Yong, Keeseon S. Eom, Duk-Young Min, Hyeong-Kyu Jeon, Tae-Yun Kim, Bong-Kwang Jung, Lay Sisabath, Bounnaloth Insisiengmay, Bounlay Phommasack, Han-Jong Rim; Korean J Parasitol 2013;51(3):305-311.
Published online June 30, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.3.305

Abstract
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In this study, we found that Haplorchis taichui, a heterophyid intestinal fluke, is highly prevalent, with heavy worm loads, among riparian people in Saravane and Champasak province, Lao PDR. Fecal specimens were collected from 1,460 people (717 men and 743 women) in 12 riparian (Mekong river) districts and were examined by the Kato-Katz fecal smear technique. The overall helminth egg positive rate was 78.8% and 66.4% in Saravane and Champasak province, respectively. The positive rate for small trematode eggs (STE), which included H. taichui and other heterophyids, Opisthorchis viverrini, and lecithodendriids, was 69.9% and 46.3% in Saravane and Champasak province, respectively. To obtain adult flukes, 30 STE-positive people were treated with 40 mg/kg praziquantel and then purged. Whole diarrheic stools were collected 4-5 times for each person and searched for fluke specimens using a stereomicroscope. Mixed infections with various species of trematodes (H. taichui, Haplorchis pumilio, O. viverrini, Prosthodendrium molenkampi, Centrocestus formosanus, and Echinochasmus japonicus) and a species of cestode (Taenia saginata) were found. However, the worm load was exceptionally high for H. taichui compared with other trematode species, with an average of 21,565 and 12,079 specimens per infected person in Saravane and Champasak province, respectively, followed by H. pumilio (41.9 and 22.5, respectively) and O. viverrini (9.4 and 1.5, respectively). These results show that diverse species of intestinal and liver flukes are prevalent among riparian people in Saravane and Champasak province, Lao PDR, with H. taichui being the exceptionally dominant species.

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Brief Communication

Current Status of Human Taeniasis in Lao People's Democratic Republic: Hyeong-Kyu Jeon, Tai-Soon Yong, Woon-Mok Sohn, Jong-Yil Chai, Duk-Young Min, Cheong-Ha Yun, Han-Jong Rim, Tiengkham Pongvongsa, Virasack Banouvong, Bounnaloth Insisiengmay, Bounlay Phommasack, Keeseon S. Eom; Korean J Parasitol 2013;51(2):259-263.
Published online April 25, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.2.259

Abstract
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Human taeniasis was investigated in Lao People's Democratic Republic (Lao PDR) between 2000 and 2011 as part of the nation's helminthiasis survey. A total of 55,038 inhabitants, including 29,846 school children, were examined using the Kato-Katz and scotch-tape anal swab method, and morphological observation of adult worms. Molecular identification of Taenia tapeworms was performed by multiplex PCR or DNA sequence analysis of the mitochondrial cox1 gene. Taenia eggs were present at a rate of 1.5% (845/55,038) in the subject population. Adult tapeworms were identified as T. solium or T. saginata by analyzing the collectable stool specimens (n=126). Three specimens identified as T. solium were found in Luang Prabang, while the remaining 123 specimens, which were T. saginata, were found in Bokeo, Bolikhamxay, Champasak, Houaphan, Khammouane, Luang Namta, Luang Prabang, Oudomxay, Phongsaly, Saysomboune, Saravane, Savannakhet, Xayaboury, Xekong, Xieng Khouang Province, and Vientiane Municipality.

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Original Articles

Echinostoma macrorchis in Lao PDR: Metacercariae in Cipangopaludina Snails and Adults from Experimentally Infected Animals: Woon-Mok Sohn, Jong-Yil Chai, Byoung-Kuk Na, Tai-Soon Yong, Keeseon S. Eom, Hansol Park, Duk-Young Min, Han-Jong Rim; Korean J Parasitol 2013;51(2):191-196.
Published online April 25, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.2.191

Abstract
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The echinostome metacercariae encysted in Cipangopaludina sp. snails that were purchased from a market in Vientiane Municipality, Lao PDR, were identified as Echinostoma macrorchis (Digenea: Echinostomatidae) through recovery of adult flukes after experimental infection to rats and a cat. The metacercariae were round, 113-128 (121)×113-125 (120) ?m, having a thick cyst wall, a head collar armed with collar spines, and excretory granules. The adult flukes recovered from the rats and cat at day 14 and 30 post-infection, respectively, were elongated, ventrally curved, and 3.9-6.3×0.7-1.1 mm in size. The head collar was distinct, bearing 43-45 collar spines with 5 angle spines on each side. Two testes were large (as the name implies), tandem, and slightly constricted at the middle, with irregular margins. Eggs were operculated, ovoid to elliptical, and 88-95×56-60 ?m. In scanning electron microscopy, the head collar was prominent, with 43-45 collar spines. Scale-like tegumental spines were densely distributed on the ventral surface between the oral and ventral suckers. Sensory papillae were distributed mainly on the tegument around the 2 suckers. It is confirmed that E. macrorchis is distributed in Lao PDR using Cipangopaludina sp. snails as the second intermediate host.

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Fishborne Trematode Metacercariae in Luang Prabang, Khammouane, and Saravane Province, Lao PDR: Han-Jong Rim, Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Jong-Yil Chai, Duk-Young Min, Soon-Hyung Lee, Eui-Hyug Hoang, Bounlay Phommasack, Sithat Insisiengmay; Korean J Parasitol 2013;51(1):107-114.
Published online February 18, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.1.107

Abstract
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Fishborne trematode (FBT) metacercariae were investigated in fish from 3 Provinces of Lao PDR. Total 242 freshwater fish of 40 species were collected in local markets of Luang Prabang (59 fish of 16 species), Khammouane (81 fish of 19 species), and Saravane (97 fish of 14 species), and each of them was examined by artificial digestion method. Four species of metacercariae (Opisthorchis viverrini, Haplorchis taichui, Haplorchis yokogawai, and Centrocestus formosanus) were detected. O. viverrini was detected in 35 fish (14.5%), and their density was 252 per infected fish (Luang Prabang, 88 metacercariae in 5 fish; Khammouane, 187 in 6 fish; Saravane, 303 in 24 fish). H. taichui was found in 102 fish (42.1%), and their density was 485 per infected fish (Luang Prabang, 260 metacercariae in 38 fish; Khammouane, 1,084 in 23 fish; Saravane, 359 in 41 fish). H. yokogawai was detected in 92 fish (38.0%), and their density was 222 per infected fish (Luang Prabang, 362 metacercariae in 17 fish; Khammouane, 126 in 20 fish; Saravane, 214 in 55 fish). Metacercariae of C. formosanus were found in 8 fish (3.3%), and their density was 3 per infected fish. In the present study, it has been confirmed that FBT metacercariae, in particular, H. taichui, H. yokogawai, and O. viverrini, are highly prevalent in fish from Luang Prabang, Khammouane, and Saravane Province, Lao PDR.

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Brief Communications

Echinostome Flukes Receovered from Humans in Khammouane Province, Lao PDR: Jong-Yil Chai, Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Duk-Young Min, Eui-Hyug Hoang, Bounlay Phammasack, Bounnaloth Insisiengmay, Han-Jong Rim; Korean J Parasitol 2012;50(3):269-272.
Published online August 13, 2012; DOI: https://doi.org/10.3347/kjp.2012.50.3.269

Abstract
PDF

Echinostome eggs were detected in 22 (1.1%) of 2,074 people residing in riparian villages along the Mekong River in Khammouane Province, Lao PDR. In order to recover the adult flukes, 9 persons were treated with praziquantel and purged with magnesium salts. A total of 55 echinostome specimens (4 species) were recovered from the 9 persons. Echinostoma revolutum (8 specimens) was recovered from 3 persons, Artyfechinostomum malayanum (8 specimens) was from 2 persons, Echinochasmus japonicus (33 specimens) was from 7 persons, and Euparyphium sp. (6 specimens) was from 1 person. In Lao PDR, only human infections with E. japonicus were previously known. Therefore, the present study describes human infections with E. revolutum, A. malayanum, and Euparyphium sp. for the first time in Lao PDR. These results indicate that the surveyed villages of Khammouane Province, Lao PDR are low-grade endemic foci of echinostomiasis.

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High Prevalence of Opisthorchis viverrini Infection in a Riparian Population in Takeo Province, Cambodia: Tai-Soon Yong, Eun-Hee Shin, Jong-Yil Chai, Woon-Mok Sohn, Keeseon S. Eom, Dong-Min Lee, Keunhee Park, Hoo-Gn Jeoung, Eui-Hyug Hoang, Yoon-Hee Lee, Hyun-Ju Woo, Ji-Hwa Lee, Sin-Il Kang, Jae-Ku Cha, Keon-Hoon Lee, Cheong-Ha Yoon, Muth Sinuon, Duong Socheat; Korean J Parasitol 2012;50(2):173-176.
Published online May 24, 2012; DOI: https://doi.org/10.3347/kjp.2012.50.2.173

Abstract
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Opisthorchis viverrini infection was found to be highly prevalent in 3 riverside villages (Ang Svay Chek A, B, and C) of the Prey Kabas District, Takeo Province. This area is located in the southern part of Cambodia, where the recovery of adult O. viverrini worms was recently reported. From May 2006 until May 2010, fecal examinations were performed on a total of 1,799 villagers using the Kato-Katz thick smear technique. In the 3 villages, the overall positive rate for helminth eggs ranged from 51.7 to 59.0% (av. 57.4%), and the percentage positive for O. viverrini was 46.4-50.6% (47.5%). Other helminths detected included hookworms (13.2%), echinostomes (2.9%), Trichuris trichiura (1.3%), Ascaris lumbricoides (0.6%), and Taenia spp. (0.06%). The prevalence of O. viverrini eggs appeared to reflect a lower infection in younger individuals (<20 years) than in the adult population (>20 years). Men (50.4%) revealed a significantly higher (P=0.02) prevalence than women (44.3%). The Ang Svay Chek villages of the Prey Kabas District, Takeo Province, Cambodia have been confirmed to be a highly endemic area for human O. viverrini infection.

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Original Article

Morphologic and Genetic Identification of Taenia Tapeworms in Tanzania and DNA Genotyping of Taenia solium: Keeseon S. Eom, Jong-Yil Chai, Tai-Soon Yong, Duk-Young Min, Han-Jong Rim, Charles Kihamia, Hyeong-Kyu Jeon; Korean J Parasitol 2011;49(4):399-403.
Published online December 16, 2011; DOI: https://doi.org/10.3347/kjp.2011.49.4.399

Abstract
PDF

Species identification of Taenia tapeworms was performed using morphologic observations and multiplex PCR and DNA sequencing of the mitochondrial cox1 gene. In 2008 and 2009, a total of 1,057 fecal samples were collected from residents of Kongwa district of Dodoma region, Tanzania, and examined microscopically for helminth eggs and proglottids. Of these, 4 Taenia egg positive cases were identified, and the eggs were subjected to DNA analysis. Several proglottids of Taenia solium were recovered from 1 of the 4 cases. This established that the species were T. solium (n=1) and T. saginata (n=3). One further T. solium specimen was found among 128 fecal samples collected from Mbulu district in Arusha, and this had an intact strobila with the scolex. Phylegenetic analysis of the mtDNA cox1 gene sequences of these 5 isolates showed that T. saginata was basal to the T. solium clade. The mitochondrial cox1 gene sequences of 3 of these Tanzanian isolates showed 99% similarity to T. saginata, and the other 2 isolates showed 100% similarity to T. solium. The present study has shown that Taenia tapeworms are endemic in Kongwa district of Tanzania, as well as in a previously identified Mbulu district. Both T. solium isolates were found to have an "African/Latin American" genotype (cox1).

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The Korean Journal of Parasitology.2013; 51(2): 197. CrossRef
Taenia solium taeniosis/cysticercosis in Africa: Risk factors, epidemiology and prospects for control using vaccination
Emmanuel Assana, Marshall W. Lightowlers, André P. Zoli, Stanny Geerts
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Molecular Approaches to Taenia asiatica
Hyeong-Kyu Jeon, Keeseon S. Eom
The Korean Journal of Parasitology.2013; 51(1): 1. CrossRef

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Brief Communications

Molecular Identification of Taenia Tapeworms by Cox1 Gene in Koh Kong, Cambodia: Hyeong-Kyu Jeon, Tai-Soon Yong, Woon-Mok Sohn, Jong-Yil Chai, Sung-Jong Hong, Eun-Taek Han, Hoo-Gn Jeong, Tep Chhakda, Muth Sinuon, Duong Socheat, Keeseon S. Eom; Korean J Parasitol 2011;49(2):195-197.
Published online June 14, 2011; DOI: https://doi.org/10.3347/kjp.2011.49.2.195

Abstract
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We collected fecal samples from 21 individuals infected with Taenia tapeworms in Koh Kong Province, Cambodia, and performed nucleotide sequencing of the cox1 gene and multiplex PCR on the eggs for DNA differential diagnosis of human Taenia tapeworms. Genomic DNA was extracted from the eggs of a minimum number of 10 isolated from fecal samples. Using oligonucleotide primers Ta7126F, Ts7313F, Tso7466F, and Rev7915, the multiplex PCR assay proved useful for differentially diagnosing Taenia solium, Taenia saginata, and Taenia asiatica based on 706, 629, and 474 bp bands, respectively. All of the Taenia specimens from Kho Kong, Cambodia, were identified as either T. saginata (n=19) or T. solium (n=2) by cox1 sequencing and multiplex PCR.

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Taeniasis impacts human gut microbiome composition and function
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Echinostoma ilocanum Infection in Oddar Meanchey Province, Cambodia: Woon-Mok Sohn, Hyeong-Jin Kim, Tai-Soon Yong, Keeseon S. Eom, Hoo-Gn Jeong, Jae-Kwang Kim, A-Reum Kang, Mok-Ryun Kim, Jung-Mi Park, Soo-Hyeon Ji, Muth Sinuon, Duong Socheat, Jong-Yil Chai; Korean J Parasitol 2011;49(2):187-190.
Published online June 14, 2011; DOI: https://doi.org/10.3347/kjp.2011.49.2.187

Abstract
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Fecal examinations using the Kato Katz technique were performed on a total of 1,287 villagers (945 students and 342 general inhabitants) of Oddar Meanchey Province, Cambodia in May 2007 and November 2009. The overall intestinal helminth egg positive rate was 23.9%, and the most prevalent helminth species was hookworms (21.6%). Other helminth eggs detected included echinostomes (1.0%), Enterobius vermicularis (0.8%), small trematode eggs (0.7%), which may include Opisthorchis viverrini and Haplorchis spp., and Hymenolepis nana (0.4%). In order to recover adult echinostomes, we treated 2 patients with 10-15 mg/kg praziquantel and purged. Total 14 adult echinostomes, 1 and 13 worms from each patient, were collected. The echinostomes characteristically had 49-51 collar spines and 2 round or slightly lobated testes. They were identified as Echinostoma ilocanum (Garrison, 1908) Odhner, 1911. So far as literature are concerned, this is the first record on the discovery of human E. ilocanum infection in Cambodia.

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