Parasites, Hosts and Diseases

"Young Yil Bahk"

Original Articles

An Evaluation of a New Quantitative Point-of Care Diagnostic to Measure Glucose-6-phosphate Dehydrogenase Activity: Young Yil Bahk, Seong Kyu Ahn, Heung Jin Jeon, Byoung-Kuk Na, Sung-Keun Lee, Ho-Joon Shin; Korean J Parasitol 2022;60(4):281-288.
Published online August 24, 2022; DOI: https://doi.org/10.3347/kjp.2022.60.4.281

Abstract
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Malaria continues to be one of the most crucial infectious burdens in endemic areas worldwide, as well as for travelers visiting malaria transmission regions. It has been reported that 8-aminoquinolines are effective against the Plasmodium species, particularly primaquine, for anti-hypnozoite therapy in P. vivax malaria. However, primaquine causes acute hemolytic anemia in individuals with glucose-6-phosphate dehydrogenase (G6PD) deficiency. Therefore, G6PD deficiency testing should precede hypnozoite elimination with 8-aminoquinoline. Several point-of-care devices have been developed to detect G6PD deficiency. The aim of the present study was to evaluate the performance of a novel, quantitative G6PD diagnostics based on a metagenomic blue fluorescent protein (mBFP). We comparatively evaluated the sensitivity and specificity of the G6PD diagnostic modality with standard methods using 120 human whole blood samples. The G6PD deficiency was spectrophotometrically confirmed. The performance of the G6PD quantitative test kit was compared with that of a licensed control medical device, the G6PD strip. The G6PD quantitative test kit had a sensitivity of 95% (95% confidence interval (CI): 89.3-100%) and a specificity of 100% (95% CI: 94.3-100%). This study shows that the novel diagnostic G6PD quantitative test kit could be a cost-effective and time-efficient, and universally mandated screening tool for G6PD deficiency.

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Performance of quantitative point-of-care tests to measure G6PD activity: An individual participant data meta-analysis
Arkasha Sadhewa, Ari Winasti Satyagraha, Mohammad Shafiul Alam, Wondimagegn Adissu, Anup Anvikar, Germana Bancone, Praveen K. Bharti, Vinod K. Bhutani, Santasabuj Das, Muzamil Mahdi Abdel Hamid, Mohammad Sharif Hossain, Nitika Nitika, Bernard A. Okech, Ly
PLOS Neglected Tropical Diseases.2025; 19(3): e0012864. CrossRef
Utilization of Glucose-6-Phosphate Dehydrogenase Test and the Prevalence of Enzyme Deficiency in Korea
Rihwa Choi, Wonseo Park, Gayoung Chun, Sang Gon Lee, Eun Hee Lee
Journal of Clinical Medicine.2023; 12(9): 3179. CrossRef

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Knowledge, Attitudes and Perceptions Regarding Endemic Vivax Malaria in Inhabitants and Patients in Two Cities of Northern Gyeonggi-do, Korea, 2020: Young Yil Bahk, Shin-Hyeong Cho, Sookkyung Park, Jeongran Kwon, Hyesu Kan, Miyoung Kim, Byoung-Kuk Na, Sung Jong Hong, Hyung Wook Kwon, Tong-Soo Kim; Korean J Parasitol 2021;59(6):595-605.
Published online December 22, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.6.595

Abstract
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An understanding of the knowledges, attitudes and perceptions of different populations is key for public health policy makers. Here, a survey was performed on knowledge, attitudes, and perceptions about malaria diagnosis, prevention, control, and treatment. The 407 survey participants included both uninfected inhabitants and patients from 2 cities (Gimpo- and Paju-si) of Northern Gyeonggi-do, known as high-risk areas for vivax malaria. We used community-based study design and non-probability sampling method using the primary data. Association between variables were tested using χ²-tests. In general, the information on malaria reported by the participants in this study was unsystematic and included inaccurate details. The knowledge of malaria symptoms, identified as headache, chills and fever, was high, but the surveyed community lacks knowledge of the specific medications used for malaria treatment, with a large number of respondents having no knowledge of any form of medication. Survey questions with high correct answer rates included questions about easy treatment of malaria in Korea, the high daytime activity of malaria-borne mosquitoes, and the infection risk posed by outdoor activities. However, a large portion of the respondents was unable to provide simple medical and biological information about the disease. This study aimed to comprehensively evaluate the knowledge, attitude, and practical behavior of the surveyed community with respect to malaria and the implications reported here could be applicable to other malaria endemic areas in Korea.

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Brief Communications

Awareness and Opinions of Inhabitants on Vivax Malaria in Two Endemic Areas, Gyeonggi-do, Korea: Young Yil Bahk, Shin-Hyeong Cho, Byoung-Kuk Na, Sung Jong Hong, Sung-Keun Lee, Tong-Soo Kim; Korean J Parasitol 2021;59(5):513-518.
Published online October 22, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.5.513

Abstract
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The incidence of vivax malaria in Korea was reduced to a low plateau. For successful elimination of vivax malaria, socio-behavioral changes in the communities are essential. This study aimed to figure out awareness of the inhabitants on the vivax malaria endemicity. The 407 participants including vivax malaria patients and uninfected inhabitants in Gimpo- and Paju-si, Gyeonggi-do, known as high-risk areas in Korea. We used a community-based study design and non-probability sampling method using primary data. Except for the perception about the public health facilities’ capability to cope with anti-malaria programs, the 2 groups of participants shared the same level of awareness about public promotional and educational measures and opinions for malaria elimination from the community. Thus, our future goals for malaria prevention and elimination are to develop more active and well-organized community-based education and evaluation programs collaborating with the community healthcare authorities and local governments.

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An Epidemiological Analysis of 28 Vivax Malaria Cases in Gimpo-si, Korea, 2020: Young Yil Bahk, Shin-Hyeong Cho, Kyoung-Nam Kim, Eun-Hee Shin, Byoung-Hak Jeon, Jeong-Hyun Kim, Sookkyung Park, Jeongran Kwon, Hyesu Kan, Miyoung Kim, Tong-Soo Kim; Korean J Parasitol 2021;59(5):507-512.
Published online October 22, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.5.507

Since 1993, vivax malaria has been recognized as a public health burden in Korea. Despite of pan-governmental malaria-control efforts and the dramatic reduction in the burden of this disease over the last 10 years, vivax malaria has not been well controlled and has remained continuously endemic. We focused interviewed and examined the charts of 28 confirmed vivax malaria patients given malarial therapy for whom daily records were kept from Gimpo-si, Gyeonggido of Korea. Various epidemiological characteristics of vivax malaria, including the incubation period, medication used, and recurrence, and an evaluation of the parasitic characteristics from the focused interviews of patients from this region are described here. Most of the participants indicated the 3 most common symptoms of malaria (headache, chills and fever). Of the 28 cases, 2 experienced a second attack and there were 17 and 11 cases with short- and long-term incubation periods, respectively, yielding a short-term to long-term ratio of 1.5. Based on the parasitemia stages, most of the participants were tested at 5 to 7 days (11 cases) and 7 to 15 days (11 cases) after initial wave of asexual parasites. In conclusion, public health authorities should consider developing management measures to decrease the time lag for diagnosis and drafting unified and robust guidelines for drug use for malaria and drawing up unified and robust guidelines on the use of medication for malaria. It also suggests that routine monitoring, surveillance, and precise medical surveys in high-risk vivax malaria endemic areas are pivotal to controlling this persistent public disease and finally eliminating it from Korea.

Citations

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Fine-Scale Spatial Prediction on the Risk of Plasmodium vivax Infection in the Republic of Korea
Kyung-Duk Min, Yae Jee Baek, Kyungwon Hwang, Na-Ri Shin, So-dam Lee, Hyesu Kan, Joon-Sup Yeom
Journal of Korean Medical Science.2024;[Epub] CrossRef
Utilization of Glucose-6-Phosphate Dehydrogenase Test and the Prevalence of Enzyme Deficiency in Korea
Rihwa Choi, Wonseo Park, Gayoung Chun, Sang Gon Lee, Eun Hee Lee
Journal of Clinical Medicine.2023; 12(9): 3179. CrossRef
Identification of breeding habitats and kdr mutations in Anopheles spp. in South Korea
Hyelee Hong, Tae-Hui Eom, Thuy-Tien Thi Trinh, Bao Duong Tuan, Hyun Park, Seon-Ju Yeo
Malaria Journal.2023;[Epub] CrossRef

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Original Article

A Profile of Glucose-6-Phosphate Dehydrogenase Variants and Deficiency of Multicultural Families in Korea: Young Yil Bahk, Seong Kyu Ahn, Jinyoung Lee, Jae Hyoung Im, Joon-Sup Yeom, Sookkyung Park, Jeongran Kwon, Hyesu Kan, Miyoung Kim, Woori Jang, Tong-Soo Kim; Korean J Parasitol 2021;59(5):447-455.
Published online October 22, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.5.447

Abstract
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Vivax malaria incidence in Korea is now decreased and showing a low plateau. Nowadays, vivax malaria in Korea is expected to be successfully eliminated with anti-malaria chemotherapy, primaquine, and vector control. The glucose-6-phosphate dehydrogenase (G6PD) deficiency is associated with potential hemolytic anemia after primaquine administration. This inborn disorder has a pivotal polymorphism with genetic variants and is the most prevalent X-chromosome-linked disorder. The prevalence of G6PD deficiency was previously reported negligible in Korea. As the population of multicultural families pertaining marriage immigrants and their adolescents increases, it is necessary to check G6PD deficiency for them prior to primaquine treatment for vivax malaria. The prevalence of G6PD variants and G6PD deficiency in multicultural families was performed in 7 counties and 2 cities of Jeollanam-do (Province), Gyeonggi-do, and Gangwon-do. A total of 733 blood samples of multicultural family participants were subjected to test the phenotypic and genetic G6PD deficiency status using G6PD enzyme activity quantitation kit and PCR-based G6PD genotyping kit. The G6PD phenotypic deficiency was observed in 7.8% of male adolescent participants and 3.2% of materfamilias population. Based on the PCR-based genotyping, we observed total 35 participants carrying the mutated alleles. It is proposed that primaquine prescription should seriously be considered prior to malaria treatment.

Citations

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Glucose-6-phosphate dehydrogenase variants in Kachin, Myanmar
Zin Moon, Ja Moon Aung, Dorene VanBik, Hae Soo Yun, Sanghyun Lee, Sylvatrie-Danne Dinzouna-Boutamba, Zau Ring, Yeonchul Hong, Dong-Il Chung, Youn-Kyoung Goo
Parasites, Hosts and Diseases.2025; 63(4): 360. CrossRef
Georacial Epidemiological Estimates of Glucose-6-Phosphate Dehydrogenase Deficiency among Newborns in the United States
Ramesh Vidavalur, Vinod K. Bhutani
American Journal of Perinatology.2024; 41(S 01): e1841. CrossRef
Suboptimal Doses of Antimalarials Relative to Increasing Body Weight and the Risk of Plasmodium vivax Recurrence in the Republic of Korea Armed Forces, 2012–2021
Young Hoon Hwang, Doran Yoon, Suryeong Go, Joon-Sup Yeom, Hong Sang Oh
Journal of Korean Medical Science.2024;[Epub] CrossRef
Utilization of Glucose-6-Phosphate Dehydrogenase Test and the Prevalence of Enzyme Deficiency in Korea
Rihwa Choi, Wonseo Park, Gayoung Chun, Sang Gon Lee, Eun Hee Lee
Journal of Clinical Medicine.2023; 12(9): 3179. CrossRef
An Evaluation of a New Quantitative Point-of Care Diagnostic to Measure Glucose-6-phosphate Dehydrogenase Activity
Young Yil Bahk, Seong Kyu Ahn, Heung Jin Jeon, Byoung-Kuk Na, Sung-Keun Lee, Ho-Joon Shin
The Korean Journal of Parasitology.2022; 60(4): 281. CrossRef

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Brief Communication

Monitoring Chigger Mites for Orientia tsutsugamushi in Field Small Mammals in Hwaseong-si, Gyeonggi-do, Korea, 2019-2020: Young Yil Bahk, Seong Kyu Ahn, Jinyoung Lee, Hyung Wook Kwon, Sung Jong Hong, Tong-Soo Kim; Korean J Parasitol 2021;59(3):319-324.
Published online June 21, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.3.319

Incidence of tsutsugamushi disease (scrub typhus) caused by Orientia tsutsugamushi, is steadily increasing. It is a mite-borne disease transmitted by chigger mites. In this study, the chigger mites were collected from field small mammals in Hwaseong-si (city), Gyeonggi-do (province), Korea, 2019 and 2020. The field small mammals captured were 56 Apodemus agrarius (94.9%) and 3 Crocidura lasiura (5.1%). A total of 7,531 chigger mites were collected from the captured small mammals. Using PCR test, 153 chigger mite pools were examined and 17 pools were reported positive for O. tsutsugamushi. The O. tsutsugamushi were identified to 5 strains; Jecheon strain was most prevalent, followed by Boryong strain. The other strains were OI011, Taguchi, and Shimokoshi. Collectively, these results provide essential regional information on mite-borne tsutsugamushi disease in the Hwaseong-si, and further contribute to bring awareness and rapid diagnosis for the tsutsugamushi disease.

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
Variation in Small Mammal Species Composition and the Occurrence of Parasitic Mites in Two Landscapes in a Scrub Typhus Endemic Region of Western Yunnan Province, China
Yun‐Yan Luo, Jia‐Xiang Yin, Zong‐Ti Shao, Zeng‐Kan Liu, Shou‐Qin Yin, Jiang‐Li Lu, Jin‐Chun Li, Rong Wei, Alan Frederick Geater
Ecology and Evolution.2025;[Epub] CrossRef
A review on trombiculiasis: An underreported parasitosis that affects humans and animals, including world distribution, clinical findings, associated pathogens, prophylaxis and identification methods
Isabella Pereira Pesenato, Ricardo Bassini-Silva, Fernando de Castro Jacinavicius
Acta Tropica.2024; 260: 107420. CrossRef
Habitat Type-Based Assemblage and Distribution Prediction of Small Mammals and Chigger Mites (Acari: Trombiculidae) in Chuncheon City, Republic of Korea
Kiyoon Kim, Jusun Hwang, Kyungmin Kim, Kwangbae Yoon, Daehyun Oh, Yungchul Park
Animals.2024; 14(23): 3433. 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
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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Original Articles

Hard Ticks as Vectors Tested Negative for Severe Fever with Thrombocytopenia Syndrome in Ganghwa-do, Korea during 2019-2020: Kyoung Jin, Yeon-Ja Koh, Seong Kyu Ahn, Joonghee Cho, Junghwan Lim, Jaeyong Song, Jinyoung Lee, Young Woo Gong, Mun Ju Kwon, Hyung Wook Kwon, Young Yil Bahk, Tong-Soo Kim; Korean J Parasitol 2021;59(3):281-289.
Published online June 21, 2021; DOI: https://doi.org/10.3347/kjp.2021.59.3.281

This study aimed to characterize the seasonal abundance of hard ticks that transmit severe fever with thrombocytopenia syndrome virus from April to November 2019 and 2020 on Ganghwa-do, Incheon Metropolitan City, Korea. The ticks were collected at grassland, grave site, copse and mountain road using a collection trap method. The ixodid hard ticks comprising three species (Haemaphysalis longicornis, H. flava, and Ixodes nipponensis) collected were 6,622 in 2019 and 3,811 in 2020. H. longicornis was the most frequent (97.9% in 2019 and 96.0% in 2020), followed by H. flava (2.0% and 3.0% in 2019 and 2020, respectively) and I. nipponensis (less than 0.1%). Our study demonstrated that seasonal patterns of the tick populations examined for two years were totally unsimilar. The hard ticks tested using RT-qPCR were all negative for severe fever with thrombocytopenia syndrome virus.

Citations

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Hard Ticks as Vectors: The Emerging Threat of Tick-Borne Diseases in India
Nandhini Perumalsamy, Rohit Sharma, Muthukumaravel Subramanian, Shriram Ananganallur Nagarajan
Pathogens.2024; 13(7): 556. CrossRef
Development of monoclonal antibody based IgG and IgM ELISA for diagnosis of severe fever with thrombocytopenia syndrome virus infection
Mei Zhang, Yanhua Du, Li Yang, Lin Zhan, Bin Yang, Xueyong Huang, Bianli Xu, Koichi Morita, Fuxun Yu
The Brazilian Journal of Infectious Diseases.2022; 26(4): 102386. CrossRef
Seasonal activity of Haemaphysalis longicornis and Haemaphysalis flava (Acari: Ixodida), vectors of severe fever with thrombocytopenia syndrome (SFTS) virus, and their SFTS virus harboring rates in Gyeonggi Province, South Korea
Hong Geun Kim, Minhyung Jung, Doo-Hyung Lee
Experimental and Applied Acarology.2022; 87(1): 97. CrossRef

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Monitoring Culicine Mosquitoes (Diptera: Culicidae) as a Vector of Flavivirus in Incheon Metropolitan City and Hwaseong-Si, Gyeonggi-Do, Korea, during 2019: Young Yil Bahk, Seo Hye Park, Myung-Deok Kim-Jeon, Sung-Suck Oh, Haneul Jung, Hojong Jun, Kyung-Ae Kim, Jong Myong Park, Seong Kyu Ahn, Jinyoung Lee, Eun-Jeong Choi, Bag-Sou Moon, Young Woo Gong, Mun Ju Kwon, Tong-Soo Kim; Korean J Parasitol 2020;58(5):551-558.
Published online October 22, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.5.551

The flaviviruses are small single-stranded RNA viruses that are typically transmitted by mosquitoes or tick vectors and are etiological agents of acute zoonotic infections. The viruses are found around the world and account for significant cases of human diseases. We investigated population of culicine mosquitoes in central region of Korean Peninsula, Incheon Metropolitan City and Hwaseong-si. Aedes vexans nipponii was the most frequently collected mosquitoes (56.5%), followed by Ochlerotatus dorsalis (23.6%), Anopheles spp. (10.9%), and Culex pipiens complex (5.9%). In rural regions of Hwaseong, Aedes vexans nipponii was the highest population (62.9%), followed by Ochlerotatus dorsalis (23.9%) and Anopheles spp. (12.0%). In another rural region of Incheon (habitat of migratory birds), Culex pipiens complex was the highest population (31.4%), followed by Ochlerotatus dorsalis (30.5%), and Aedes vexans vexans (27.5%). Culex pipiens complex was the predominant species in the urban region (84.7%). Culicine mosquitoes were identified at the species level, pooled up to 30 mosquitoes each, and tested for flaviviral RNA using the SYBR Green-based RT-PCR and confirmed by cDNA sequencing. Three of the assayed 2,683 pools (989 pools without Anopheles spp.) were positive for Culex flaviviruses, an insect-specific virus, from Culex pipiens pallens collected at the habitats for migratory birds in Incheon. The maximum likelihood estimation (the estimated number) for Culex pipiens pallens positive for Culex flavivirus was 25. Although viruses responsible for mosquito-borne diseases were not identified, we encourage intensified monitoring and long-term surveillance of both vector and viruses in the interest of global public health.

Citations

Citations to this article as recorded by

Abundance, Diversity and Distribution of Mosquito Species and Molecular Detection of Its Associated Hepatitis C Virus in Sharkia Governorate, Egypt
Tharwat A. Selim, Sanad H. Ragab, Saber A. Riad, Randa I. Eltaly, Shaimaa H. Mohammed, Somia Eissa Sharawi, Naser Ahmed Alkenani, Ruoa Saleh Almahallawi, Hayat S. Al-Rashidi, Mohamed A. M. El-Tabakh
Insects.2025; 16(4): 433. CrossRef
Leveraging insect-specific viruses to elucidate mosquito population structure and dynamics
Brandon D. Hollingsworth, Nathan D. Grubaugh, Brian P. Lazzaro, Courtney C. Murdock, Helen M. Lazear
PLOS Pathogens.2023; 19(8): e1011588. CrossRef
Molecular detection and identification of Culex flavivirus in mosquito species from Jeju, Republic of Korea
Shilpa Chatterjee, Choon-Mee Kim, Na Ra Yun, Dong-Min Kim, Hyeon Je Song, Kyeoung A Chung
Virology Journal.2021;[Epub] CrossRef
National Monitoring of Mosquito Populations and Molecular Analysis of Flavivirus in the Republic of Korea in 2020
Min-Goo Seo, Hak Seon Lee, Sung-Chan Yang, Byung-Eon Noh, Tae-Kyu Kim, Wook-Gyo Lee, Hee Il Lee
Microorganisms.2021; 9(10): 2085. CrossRef
Recent Spatial and Temporal Trends of Malaria in Korea
Yeong Hoon Kim, Hye-Jin Ahn, Dongjae Kim, Sung-Jong Hong, Tong-Soo Kim, Ho-Woo Nam
The Korean Journal of Parasitology.2021; 59(6): 585. CrossRef

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Monitoring Insecticide Resistance and Target Site Mutations of L1014 Kdr And G119 Ace Alleles in Five Mosquito Populations in Korea: Seo Hye Park, Hojong Jun, Seong Kyu Ahn, Jinyoung Lee, Sung-Lim Yu, Sung Keun Lee, Jung-Mi Kang, Hyunwoo Kim, Hee-Il Lee, Sung-Jong Hong, Byoung-Kuk Na, Young Yil Bahk, Tong-Soo Kim; Korean J Parasitol 2020;58(5):543-550.
Published online October 22, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.5.543

Mosquitoes are globally distributed and important vectors for the transmission of many human diseases. Mosquito control is a difficult task and the cost of preventing mosquito-borne diseases is much lower than that for curing the associated diseases. Thus, chemical control remains the most effective tool for mosquito. Due to the long-term intensive use of insecticides to control mosquito vectors, resistance to most chemical insecticides has been reported. This study aimed to investigate the relationship between insecticide resistance and target site mutation of L1014 kdr and G119 ace alleles in 5 species/species group of mosquitoes (Aedes vexans, Ae. albopictus, Anopheles spp., Culex pipiens complex, and Cx. tritaeniorhynchus) obtained from 6 collection sites. For Anopheles spp., the proportion of mosquitoes with mutated alleles in L1014 was 88.4%, homozygous resistant genotypes were observed in 46.7%, and heterozygous resistant genotypes were observed in 41.8%. For the Cx. pipiens complex and Cx. tritaeniorhynchus species, homozygous resistant genotypes were found in 25.9% and 9.8%, respectively. However, target site mutation of L1014 in the Ae. vexans nipponii and Ae. albopictus species was not observed. Anopheles spp., Cx. pipiens complex, and Cx. tritaeniorhynchus mosquitoes were resistant to deltamethrin and chlorpyriphos, whereas Ae. vexans nipponii and Ae. albopictus were clearly susceptible. We also found a correlation between the resistance phenotype and the presence of the L1014 kdr and G119 ace mutations only in the Anopheles spp. population. In this study, we suggest that insecticide resistance poses a growing threat and resistance management must be integrated into all mosquito control programs.

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Seasonal fluctuation of insecticide resistance mutation frequencies in field populations of Anopheles and Culex species in Korea
Do Eun Lee, Heung-Chul Kim, Terry A Klein, Si Hyeock Lee, Ju Hyeon Kim, Alec Gerry
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Nikhil Bharadwaj, Rohit Sharma, Muthukumaravel Subramanian, Gnanasekar Ragini, Shriram Ananganallur Nagarajan, Manju Rahi
International Journal of Molecular Sciences.2025; 26(5): 1854. CrossRef
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Jiseung Jeon, Jihun Ryu, Kwang Shik Choi
Acta Tropica.2024; 249: 107058. CrossRef
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Turkish Journal of Entomology.2024; 48(2): 213. CrossRef
Inference of selection pressures that drive insecticide resistance in Anopheles and Culex mosquitoes in Korea
Do Eun Lee, Jeewoo Shin, Young Ho Kim, Kwang Shik Choi, Hyeyeong Choe, Kwang Pum Lee, Si Hyeock Lee, Ju Hyeon Kim
Pesticide Biochemistry and Physiology.2023; 194: 105520. CrossRef
CDC Bottle Bioassays for Detection of Insecticide Resistance in Culex pipiens, Aedes albopictus, and Aedes koreicus Collected on US Army Garrisons, Republic of Korea
Craig A. Stoops, Myong Sun Kim, Sanjeev Mahabir, Sung Tae Chong, Stephanie S. Cinkovich, Jennifer B. Carder
Journal of the American Mosquito Control Association.2023; 39(3): 208. CrossRef
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Entomological Research.2023; 53(12): 600. CrossRef

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Surveillance of Chigger Mite Vectors for Tsutsugamushi Disease in the Hwaseong Area, Gyeonggi-do, Republic of Korea, 2015: Young Yil Bahk, Hojong Jun, Seo Hye Park, Haneul Jung, Seung Jegal, Myung-Deok Kim-Jeon, Jong Yul Roh, Wook-Gyo Lee, Seong Kyu Ahn, Jinyoung Lee, Kwangsig Joo, Young Woo Gong, Mun Ju Kwon, Tong-Soo Kim; Korean J Parasitol 2020;58(3):301-308.
Published online June 26, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.3.301

Owing to global climate change, the global resurgence of vector-borne infectious diseases and their potential to inflict widespread casualties among human populations has emerged as a pivotal burden on public health systems. Tsutsugamushi disease (scrub typhus) in the Republic of Korea is steadily increasing and was designated as a legal communicable disease in 1994. The disease is a mite-borne acute febrile disease most commonly contracted from October to December. In this study, we tried to determine the prevalence of tsutsugamushi disease transmitted by chigger mites living on rodents and investigated their target vector diversity, abundance, and distribution to enable the mapping of hotspots for this disease in 2015. A total of 5 species belonging to 4 genera (109 mites): Leptotrombidium scutellare 60.6%, L. pallidum 28.4% Neotrombicula tamiyai 9.2%, Euschoengastia koreaensis/0.9%), and Neoschoengastia asakawa 0.9% were collected using chigger mite collecting traps mimicking human skin odor and sticky chigger traps from April to November 2015. Chigger mites causing tsutsugamushi disease in wild rodents were also collected in Hwaseong for the zoonotic surveillance of the vector. A total of 77 rodents belonging to 3 genera: Apodemus agrarius (93.5%), Crocidura lasiura (5.2%), and Micromys minutus (1.3%) were collected in April, October, and November 2015. The most common mite was L. pallidum (46.9%), followed by L. scutellare (18.6%), and L. orientale (18.0%). However, any of the chigger mite pools collected from rodent hosts was tested positive for Orientia tsutsugamushi, the pathogen of tsutsugamushi disease, in this survey.

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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 Prevalence of Rodents Orientia tsutsugamushi in China During Two Decades: A Systematic Review and Meta-Analysis
Yan-Chun Wang, Jing-Hao Li, Ya Qin, Si-Yuan Qin, Chao Chen, Xin-Bo Yang, Ning Ma, Ming-Xin Dong, Cong-Cong Lei, Xing Yang, He-Ting Sun, Zhi-Yong Sun, Jing Jiang
Vector-Borne and Zoonotic Diseases.2023; 23(12): 619. CrossRef
Epidemiological and clinical characteristics of scrub typhus in northern Fujian, China, from 2015 to 2019
Jin Huang, Kaixiang Deng, Jiawei Chen, Meiquan Zhang
BMC Infectious Diseases.2023;[Epub] CrossRef
Clinical treatment of patients with scrub typhus-induced liver injury and intracranial infection
HongKui Sun, Li Lei, JianWei Li, Haiming Niu, Jiezhang Yang, MiaoLian Chen
Journal of International Medical Research.2023;[Epub] CrossRef
Monitoring Chigger Mites for Orientia tsutsugamushi in Field Small Mammals in Hwaseong-si, Gyeonggi-do, Korea, 2019-2020
Young Yil Bahk, Seong Kyu Ahn, Jinyoung Lee, Hyung Wook Kwon, Sung Jong Hong, Tong-Soo Kim
The Korean Journal of Parasitology.2021; 59(3): 319. CrossRef
Nationwide Incidence of Chigger Mite Populations and Molecular Detection of Orientia tsutsugamushi in the Republic of Korea, 2020
Min-Goo Seo, Bong-Goo Song, Tae-Kyu Kim, Byung-Eon Noh, Hak Seon Lee, Wook-Gyo Lee, Hee Il Lee
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Infestation and Related Ecology of Chigger Mites on the Asian House Rat (Rattus tanezumi) in Yunnan Province, Southwest China
Fan Ding, Wen-Li Jiang, Xian-Guo Guo, Rong Fan, Cheng-Fu Zhao, Zhi-Wei Zhang, Ke-Yu Mao, Rong Xiang
The Korean Journal of Parasitology.2021; 59(4): 377. CrossRef
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
The Korean Journal of Parasitology.2021; 59(5): 473. CrossRef
Density of Chigger Mites as Tsutsugamushi Vectors Collected from Jinan, Jeollabuk-do
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Diagnostic Performance of Three Rapid Diagnostic Test Kits for Malaria Parasite Plasmodium falciparum: Seo Hye Park, Seung Jegal, Seong Kyu Ahn, Haneul Jung, Jinyoung Lee, Byoung-Kuk Na, Sung-Jong Hong, Young Yil Bahk, Tong-Soo Kim; Korean J Parasitol 2020;58(2):147-152.
Published online April 30, 2020; DOI: https://doi.org/10.3347/kjp.2020.58.2.147

Abstract
PDF

Malaria is a potent burden on public healthcare worldwide due to requiring rapid diagnosis and treatment. Nowadays, prompt diagnosis with rapid diagnostic tests (RDTs) has been widely accepted as an effective diagnostic technique in malaria-endemic countries, primarily due to their easy operation, fast output, and straightforward interpretation. The global availability and use of RDTs have gradually grown over recent decades as field-applicable diagnostic tests for the reliable confirmation of malaria infection and proper case management. This study was conducted to evaluate diagnostic performance of 3 commercially available malaria RDT kits : BIOCREDIT^TM Malaria Ag Pf(pLDH), Malaria Ag Pf(pLDH/pHRPII), and Malaria Ag Pf/Pv(pLDH/pLDH) (where pLDH and pHRPII stand for plasmodium lactate dehydrogenase and histidine-rich protein 2, respectively) for the specific detection of Plasmodium falciparum. A total of 1,129 blood samples including 95 blood samples, confirmed as vivax malaria infection by microscopic examinations and a nested-PCR method, were tested for falciparum malaria infection. The overall sensitivity and specificity of Malaria Ag Pf(pLDH/pHRPII), Malaria Ag Pf/Pv(pLDH/pLDH), and Pf(pLDH) for P. falciparum were 99.0% and 100%, 95.8% and 100%, and 100% and 100%, respectively. It is proposed that the 3 RDT kits perform reliable level of diagnostic accuracy of detection for P. falciparum parasites.

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The Korean Journal of Parasitology.2021; 59(6): 585. CrossRef

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Four Year Surveillance of the Vector Hard Ticks for SFTS, Ganghwa-do, Republic of Korea: Myung-Deok Kim-Jeon, Seung Jegal, Hojong Jun, Haneul Jung, Seo Hye Park, Seong Kyu Ahn, Jinyoung Lee, Young Woo Gong, Kwangsig Joo, Mun Ju Kwon, Jong Yul Roh, Wook-Gyo Lee, Young Yil Bahk, Tong-Soo Kim; Korean J Parasitol 2019;57(6):691-698.
Published online December 31, 2019; DOI: https://doi.org/10.3347/kjp.2019.57.6.691

Abstract
PDF

The seasonal abundance of hard ticks that transmit severe fever with thrombocytopenia syndrome virus was monitored with a collection trap method every April to November during 2015-2018 and with a flagging method every July and August during 2015-2018 in Ganghwa-do (island) of Incheon Metropolitan City, Republic of Korea. This monitoring was performed in a copse, a short grass field, coniferous forest and broad-leaved forest. A total of 17,457 ticks (8,277 larvae, 4,137 nymphs, 3,389 females, and 1,654 males) of the ixodid ticks comprising 3 species (Haemaphysalis longicornis, H. flava, and Ixodes nipponensis) were collected with collection traps. Of the identified ticks, H. longicornis was the most frequently collected ticks (except larval ticks) (94.26%, 8,653/9,180 ticks (nymphs and adults)), followed by H. flava (5.71%, 524/9,180) and Ix. nipponensis (less than 0.04%, 3/9,180). The ticks collected with collecting traps were pooled and assayed for the presence of SFTS virus with negative results. In addition, for monitoring the prevalence of hard ticks, a total of 7,461 ticks (5,529 larvae, 1,272 nymphs, 469 females, and 191 males) of the ixodid ticks comprising 3 species (H. longicornis, H. flava, and Ix. nipponensis) were collected with flagging method. H. longicornis was the highest collected ticks (except larval ticks) (99.53%, 1,908/1,917 ticks (nymphs and adults)), followed by H. flava (1.15%, 22/1,917).

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Brief Communication

An Evaluation of Active Case Detection in Malaria Control Program in Kiyuni Parish of Kyankwanzi District, Uganda: Young Yil Bahk, Pyo Yun Cho, Seong Kyu Ahn, Woo-Joo Lee, Tong-Soo Kim, Working Groups in ChildFund Korea , Uganda; Korean J Parasitol 2018;56(6):625-632.
Published online December 31, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.6.625

Abstract
PDF

Malaria remains one of the leading health burdens in the developing world, especially in several sub-Saharan Africa countries; and Uganda has some of the highest recorded measures of malaria transmission intensity in the world. It is evident that the prevalence of malaria infection, the incidence of disease, and mortality from severe malaria remain very high in Uganda. Although the recent stable political and economic situation in the last few decades in Uganda supported for a fairly good appreciation of malaria control, the declines in infection, morbidity, and mortality are not sufficient to interrupt transmission and this country is among the top 4 countries with cases of malaria, especially among children under 5 years of age. In fact, Uganda, which is endemic in over 95% of the country, is a representative of challenges facing malaria control in Africa. In this study, we evaluated an active case detection program in 6 randomly selected villages, Uganda. This program covered a potential target population of 5,017 individuals. Our team screened 12,257 samples of malaria by active case detection, every 4 months, from February 2015 to January 2017 in the 6 villages (a total of 6 times). This study assessed the perceptions and practices on malaria control in Kiyuni Parish of Kyankwanzi district, Uganda. Our study presents that the incidence of malaria is sustained high despite efforts to scale-up and improve the use of LLINs and access to ACDs, based on the average incidence confirmed by RDTs.

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The impact of mass screening and treatment interventions on malaria incidence and prevalence: a retrospective analysis of a malaria elimination programme in eastern Myanmar, and systematic review and meta-analysis
Jade D. Rae, Angela Devine, Chanapat Patekkham, Aung Myint Thu, Gilles Delmas, Daniel M. Parker, Richard J. Maude, Jacher Wiladphaingern, Ladda Kajeechiwa, May Myo Thwin, Saw Win Tun, Julie A. Simpson, François H. Nosten
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Joanne Atieno Ogunah, Joseph O. Lalah, Karl-Werner Schramm
Sustainable Chemistry and Pharmacy.2020; 18: 100339. CrossRef

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Mini Reviews

Genetic Diversity of Plasmodium vivax Causing Epidemic Malaria in the Republic of Korea: Young Yil Bahk, Jeonga Kim, Seong Kyu Ahn, Byoung-Kuk Na, Jong-Yil Chai, Tong-Soo Kim; Korean J Parasitol 2018;56(6):545-552.
Published online December 31, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.6.545

Abstract
PDF

Plasmodium vivax is more challenging to control and eliminate than P. falciparum due to its more asymptomatic infections with low parasite densities making diagnosis more difficult, in addition to its unique biological characteristics. The potential re-introduction of incidence cases, either through borders or via human migrations, is another major hurdle to sustained control and elimination. The Republic of Korea has experienced re-emergence of vivax malaria in 1993 but is one of the 32 malaria-eliminating countries to-date. Despite achieving successful nationwide control and elimination of vivax malaria, the evolutionary characteristics of vivax malaria isolates in the Republic of Korea have not been fully understood. In this review, we present an overview of the genetic variability of such isolates to increase understanding of the epidemiology, diversity, and dynamics of vivax populations in the Republic of Korea.

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Epidemiological Characteristics of Re-emerging Vivax Malaria in the Republic of Korea (1993-2017): Young Yil Bahk, Hyeong-Woo Lee, Byoung-Kuk Na, Jeonga Kim, Kyoung Jin, Yeong Seon Hong, Tong-Soo Kim; Korean J Parasitol 2018;56(6):531-543.
Published online December 31, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.6.531

Abstract
PDF

Historically, Plasmodium vivax malaria has been one of the most highly endemic parasitic diseases in the Korean Peninsula. Until the 1970s, vivax malaria was rarely directly lethal and was controlled through the Korean Government Program administered by the National Malaria Eradication Service in association with the World Health Organization’s Global Malaria Eradication Program. Vivax malaria has re-emerged in 1993 near the Demilitarized Zone between South and North Korea and has since become an endemic infectious disease that now poses a serious public health threat through local transmission in the Republic of Korea. This review presents major lessons learned from past and current malaria research, including epidemiological and biological characteristics of the re-emergent disease, and considers some interesting patterns of diversity. Among other features, this review highlights temporal changes in the genetic make-up of the parasitic population, patient demographic features, and spatial distribution of cases, which all provide insight into the factors contributing to local transmission. The data indicate that vivax malaria in Korea is not expanding expo- nentially. However, continued surveillance is needed to prevent future resurgence.

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Recent Spatial and Temporal Trends of Malaria in Korea
Yeong Hoon Kim, Hye-Jin Ahn, Dongjae Kim, Sung-Jong Hong, Tong-Soo Kim, Ho-Woo Nam
The Korean Journal of Parasitology.2021; 59(6): 585. CrossRef
Knowledge, Attitudes and Perceptions Regarding Endemic Vivax Malaria in Inhabitants and Patients in Two Cities of Northern Gyeonggi-do, Korea, 2020
Young Yil Bahk, Shin-Hyeong Cho, Sookkyung Park, Jeongran Kwon, Hyesu Kan, Miyoung Kim, Byoung-Kuk Na, Sung Jong Hong, Hyung Wook Kwon, Tong-Soo Kim
The Korean Journal of Parasitology.2021; 59(6): 595. CrossRef
Three-year surveillance of culicine mosquitoes (Diptera: Culicidae) for flavivirus infections in Incheon Metropolitan City and Hwaseong-si of Gyeonggi-do Province, Republic of Korea
Seung Jegal, Hojong Jun, Myung-Deok Kim-Jeon, Seo Hye Park, Seong Kyu Ahn, Jinyoung Lee, Young Woo Gong, Kwangsig Joo, Mun Ju Kwon, Jong Yul Roh, Wook-Gyo Lee, Woojoo Lee, Young Yil Bahk, Tong-Soo Kim
Acta Tropica.2020; 202: 105258. CrossRef
Geographical Genetic Variation and Sources of Korean Aedes albopictus (Diptera: Culicidae) Populations
EunJung Lee, Seong-Chan Yang, Tae-Kyu Kim, Byung-Eon Noh, Hak Seon Lee, Hyunwoo Kim, Jong Yul Roh, Wook-Gyo Lee, Michel Slotman
Journal of Medical Entomology.2020; 57(4): 1057. CrossRef
Flaviviral disease mosquito vector surveillance in Incheon Metropolitan City and the Hwaseong area, Gyeonggi‐Do, Republic of Korea, in 2015
Young Yil Bahk, Hojong Jun, Seung Jegal, Myung‐Deok Kim‐Jeon, Jong Yul Roh, Wook‐Gyo Lee, Seo Hye Park, Seong Kyu Ahn, Jinyoung Lee, Young Woo Gong, Mun Ju Kwon, Tong‐Soo Kim
Entomological Research.2020; 50(1): 3. CrossRef
Monitoring Insecticide Resistance and Target Site Mutations of L1014 Kdr And G119 Ace Alleles in Five Mosquito Populations in Korea
Seo Hye Park, Hojong Jun, Seong Kyu Ahn, Jinyoung Lee, Sung-Lim Yu, Sung Keun Lee, Jung-Mi Kang, Hyunwoo Kim, Hee-Il Lee, Sung-Jong Hong, Byoung-Kuk Na, Young Yil Bahk, Tong-Soo Kim
The Korean Journal of Parasitology.2020; 58(5): 543. CrossRef
Prevention of re-establishment of malaria: historical perspective and future prospects
S. M. Ibraheem Nasir, Sachini Amarasekara, Renu Wickremasinghe, Deepika Fernando, Preethi Udagama
Malaria Journal.2020;[Epub] CrossRef
Association of Anopheles sinensis average abundance and climate factors: Use of mosquito surveillance data in Goyang, Korea
Jin Young Jang, Byung Chul Chun, Jeffrey Shaman
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Genetic Diversity of Plasmodium vivax Causing Epidemic Malaria in the Republic of Korea
Young Yil Bahk, Jeonga Kim, Seong Kyu Ahn, Byoung-Kuk Na, Jong-Yil Chai, Tong-Soo Kim
The Korean Journal of Parasitology.2018; 56(6): 545. CrossRef

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Original Article

Comparative Assessment of Diagnostic Performances of Two Commercial Rapid Diagnostic Test Kits for Detection of Plasmodium spp. in Ugandan Patients with Malaria: Young Yil Bahk, Seo Hye Park, Woojoo Lee, Kyoung Jin, Seong Kyu Ahn, Byoung-Kuk Na, Tong-Soo Kim; Korean J Parasitol 2018;56(5):447-452.
Published online October 31, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.5.447

Abstract
PDF

Prompt diagnosis of malaria cases with rapid diagnostic tests (RDTs) has been widely adopted as an effective malaria diagnostic tool in many malaria endemic countries, primarily due to their easy operation, fast result output, and straightforward interpretation. However, there has been controversy about the diagnostic accuracy of RDTs. This study was conducted to evaluate the diagnostic performances of the 2 commercially available malaria RDT kits, RapiGEN Malaria Ag Pf/Pv (pLDH/pLDH) and Asan EasyTestTM Malaria Ag Pf/Pv (HRP-2/pLDH) for their abilities to detect Plasmodium species in blood samples collected from Ugandan patients with malaria. To evaluate the diagnostic performances of these 2 RDT kits, 229 blood samples were tested for malaria infection by microscopic examination and a species-specific nested polymerase chain reaction. The detection sensitivities for P. falciparum of Malaria Ag Pf/Pv (pLDH/pLDH) and Asan EasyTestTM Malaria Ag Pf/Pv (HRP-2/pLDH) were 87.83% and 89.57%, respectively. The specificities of the 2 RDTs were 100% for P. falciparum and mixed P. falciparum/P. vivax infections. These results suggest that the 2 RDT kits showed reasonable levels of diagnostic performances for detection of the malaria parasites from Ugandan patients. However, neither kit could effectively detect P. falciparum infections with low parasitaemia (<500 parasites/μl).

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Cochrane Database of Systematic Reviews.2020;[Epub] CrossRef
Status of common parasitic diseases in Korea in 2019
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Journal of the Korean Medical Association.2019; 62(8): 437. CrossRef

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Mini Review

Prevention and Control Strategies for Parasitic Infections in the Korea Centers for Disease Control and Prevention: Young Yil Bahk, Eun-Hee Shin, Shin-Hyeong Cho, Jung-Won Ju, Jong-Yil Chai, Tong-Soo Kim; Korean J Parasitol 2018;56(5):401-408.
Published online October 31, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.5.401

Abstract
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Korea is successfully controlled intestinal parasitic infections owing to economic development and high health consciousness. The Division of Vectors and Parasitic Diseases (formerly the Division of Malaria and Parasitology) is in the Center for Laboratory Control of Infectious Diseases of the Korea Centers for Disease Control and Prevention. It has been the governmental agency responsible for controlling and leading scientific research on parasitic diseases. The Division of Vectors and Parasitic Diseases has conducted and funded basic research and disseminated the research results to various medical fields, ultimately promoting public health in Korea. Among the noteworthy achievements of this division are the national surveillance of healthcare-associated parasitic infections, prevention and control for parasitic infections, and the elimination of lymphatic filariasis from Korea. On a broader scale, the division’s research programs and academic supports were influential in preventing and treating infectious parasitic diseases through public policies and laws. In this review, we summarize the past and present role of the Division of Vectors and Parasitic Diseases in preventing and treating infectious parasitic diseases in Korea.

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Original Article

Survey on Intestinal Helminthic Infection Status of Students in Two Counties, Hadong-gun and Goseong-gun, Korea: Young Yil Bahk, Yun-Kyu Park, Byoung-Kuk Na, Woon-Mok Sohn, Sung-Jong Hong, Jong-Yil Chai, Tong-Soo Kim; Korean J Parasitol 2018;56(4):335-339.
Published online August 31, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.4.335

Abstract
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This study was conducted to investigate the prevalence of intestinal parasites among students from Goseonggun, Gangwon-do and Hadong-gun, Gyeongsangnam-do as typical low and high endemic counties. From May to July 2017, a total of 2,033 fecal samples were collected at 27 elementary, 10 junior high, and 8 high schools from 2 counties and examined by the Kato-Katz technique for egg-positive surveys (Collection rate: 37.02% [2,033/5,492]). Of the participants examined, 13 (0.64%) were found to harbor eggs of 3 parasitic species, Trichuris trichiura, Clonorchis sinensis and Metagonimus yokogawai. Based on the regional distribution, the egg-positive rate in Goseong-gun was 0% (0/550) and that in Hadong-gun was 0.88% (13/1,483). The positive rates for C. sinensis, M. yokogawai, and T. trichiura in Hadonggun were 0.20% (3/1,483), 0.61% (9/1,483), and 0.07% (1/1,483), respectively. The present survey showed that the prevalence of parasitic infection among students is currently very low even in remote, previously endemic areas, and the present status of parasitic diseases can be summarized as some transmission of fish/food-borne trematodes. Thus, it is necessary to carefully, continuously monitor the trematode infection status, particularly of C. sinensis and M. yokogawai.

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The spatial-temporal risk profiling of Clonorchis sinensis infection over 50 years implies the effectiveness of control programs in South Korea: a geostatistical modeling study
Hai-Yan Xiao, Jong-Yil Chai, Yue-Yi Fang, Ying-Si Lai
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Rachel Tidman, Kaushi S. T. Kanankege, Mathieu Bangert, Bernadette Abela-Ridder, Paul R. Torgerson
PLOS Neglected Tropical Diseases.2023; 17(3): e0011073. CrossRef
Risk Factors for Clonorchis sinensis Infection in Residents of Binyang, Guangxi: A Cross-Sectional and Logistic Analysis Study
Meng Xu, Yanyan Jiang, Jianhai Yin, Shengkui Cao, Yujuan Shen, Jianping Cao
Frontiers in Public Health.2021;[Epub] CrossRef
Currently Available Monitoring and Surveillance Systems for Taenia spp., Echinococcus spp., Schistosoma spp., and Soil-Transmitted Helminths at the Control/Elimination Stage: A Systematic Review
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Sun Huh
Journal of the Korean Medical Association.2019; 62(8): 437. CrossRef
Blood Pressure and the Risk of Death From Non-cardiovascular Diseases: A Population-based Cohort Study of Korean Adults
Jeoungbin Choi, Jieun Jang, Yoonsuk An, Sue K. Park
Journal of Preventive Medicine and Public Health.2018; 51(6): 298. CrossRef

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6 Web of Science
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Brief Communications

Monitoring of Noxious Protozoa for Management of Natural Water Resources: Young Yil Bahk, Pyo Yun Cho, Sung Kyu Ahn, Sangjung Park, Won Hwa Jheong, Yun-Kyu Park, Ho-Joon Shin, Sang-Seob Lee, Okjae Rhee, Tong-Soo Kim; Korean J Parasitol 2018;56(2):205-210.
Published online April 30, 2018; DOI: https://doi.org/10.3347/kjp.2018.56.2.205

Abstract
PDF

Waterborne parasitic protozoa, particularly Giardia lamblia and Cryptosporidium spp., are common causes of diarrhea and gastroenteritis worldwide. The most frequently identified source of infestation is water, and exposure involves either drinking water or recreation in swimming pools or natural bodies of water. In practice, studies on Cryptosporidium oocysts and Giardia cysts in surface water are challenging owing to the low concentrations of these microorganisms because of dilution. In this study, a 3-year monitoring of Cryptosporidium parvum, Giardia lamblia, and Naegleria fowleri was conducted from August 2014 to June 2016 at 5 surface water sites including 2 lakes, 1 river, and 2 water intake plants. A total of 50 water samples of 40 L were examined. Cryptosporidium oocysts were detected in 22% of samples and Giardia cysts in 32%. Water at the 5 sampling sites was all contaminated with Cryptosporidium oocysts (0-36/L), Giardia cysts (0-39/L), or both. The geometric mean concentrations of Cryptosporidium and Giardia were 1.14 oocysts/L and 4.62 cysts/L, respectively. Thus, effective monitoring plans must take into account the spatial and temporal parameters of contamination because they affect the prevalence and distribution of these protozoan cysts in local water resources.

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Shahira Abdelaziz Ali Ahmed, Sonia Boughattas, Mohammad Reza Mahmoudi, Huma Khan, Simuzar Mamedova, Ardra Namboodiri, Frederick R. Masangkay, Panagiotis Karanis
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Toll-Like Receptor-Mediated Free Radical Generation in Clonorchis sinensis Excretory-Secretory Product-Treated Cholangiocarcinoma Cells: Young Yil Bahk, Jhang Ho Pak; Korean J Parasitol 2016;54(5):679-684.
Published online October 31, 2016; DOI: https://doi.org/10.3347/kjp.2016.54.5.679

Abstract
PDF

Clonorchiasis, caused by direct contact with Clonorchis sinensis worms and their excretory-secretory products (ESPs), is associated with chronic inflammation, malignant changes in bile ducts, and even cholangiocarcinogenesis. Our previous report revealed that intracellular free radicals enzymatically generated by C. sinensis ESPs cause NF-κB-mediated inflammation in human cholangiocarcinoma cells (HuCCT1). Therefore, the present study was conducted to examine the role of upstream Toll-like receptors (TLRs) on the initial host innate immune responses to infection. We found that treatment of HuCCT1 cells with native ESPs induced changes in TLR mRNA levels in a time-dependent manner, concomitant with the generation of free radicals. ESP-mediated free radical generation was markedly attenuated by preincubation of the cells with TLR1-4-neutralizing antibodies, indicating that at least TLR1 through 4 participate in stimulation of the host innate immune responses. These findings indicate that free radicals triggered by ESPs are critically involved in TLR signal transduction. Continuous signaling by this pathway may function in initiating C. sinensis infection-associated inflammation cascades, a detrimental event leading to progression to more severe hepatobiliary diseases.

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Clonorchis sinensis and Cholangiocarcinoma
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Yuru Wang, Xiaocen Wang, Nan Zhang, Yanhui Yu, Penglin Bao, Yeting Ma, Haoyang Zhang, Xu Zhang, Xichen Zhang, Pengtao Gong, Xin Li, Jianhua Li
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Original Articles

Trematodes Recovered in the Small Intestine of Stray Cats in the Republic of Korea: Jong-Yil Chai, Young Yil Bahk, Woon-Mok Sohn; Korean J Parasitol 2013;51(1):99-106.
Published online February 18, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.1.99

Abstract
PDF

In 2005, we reported the infection status of 438 stray cats with various species of intestinal helminths, including nematodes (4 species), trematodes (23 species), and cestodes (5 species) in the Republic of Korea. However, morphologic details of each helminth species have not been provided. In the present study, we intended to describe morphologic details of 13 trematode species which were either new fauna of cats (10 species) or new fauna of not only cats but also all animal hosts (3 species). The worms were fixed in 10% neutral buffered formalin under a cover slip pressure, stained with Semichon's acetocarmine, and then observed using a light microscope equipped with a micrometer. The 13 subjected species included members of the Heterophyidae (Stellantchasmus falcatus, Stictodora fuscata, Stictodora lari, Centrocestus armatus, Procerovum varium, and Cryptocotyle concava), Echinostomatidae (Echinostoma hortense, Echinostoma revolutum, Echinochasmus japonicus, and Stephanoprora sp.), Diplostomidae (Neodiplostomum seoulense), Plagiorchiidae (Plagiorchis muris), and Dicrocoeliidae (Eurytrema pancreaticum). By the present study, Cryptocotyle sp. and Neodiplostomum sp. recored in our previous study were identified as C. concava and N. seoulense, respectively. Three species, P. varium, C. concava, and Stephanoprora sp., are new trematode fauna in Korea.

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Entamoeba histolytica Induces Cell Death of HT29 Colonic Epithelial Cells via NOX1-Derived ROS: Kyeong Ah Kim, Ju Young Kim, Young Ah Lee, Arim Min, Young Yil Bahk, Myeong Heon Shin; Korean J Parasitol 2013;51(1):61-68.
Published online February 18, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.1.61

Abstract
PDF

Entamoeba histolytica, which causes amoebic colitis and occasionally liver abscess in humans, is able to induce host cell death. However, signaling mechanisms of colon cell death induced by E. histolytica are not fully elucidated. In this study, we investigated the signaling role of NOX in cell death of HT29 colonic epithelial cells induced by E. histolytica. Incubation of HT29 cells with amoebic trophozoites resulted in DNA fragmentation that is a hallmark of apoptotic cell death. In addition, E. histolytica generate intracellular reactive oxygen species (ROS) in a contact-dependent manner. Inhibition of intracellular ROS level with treatment with DPI, an inhibitor of NADPH oxidases (NOXs), decreased Entamoeba-induced ROS generation and cell death in HT29 cells. However, pan-caspase inhibitor did not affect E. histolytica-induced HT29 cell death. In HT29 cells, catalytic subunit NOX1 and regulatory subunit Rac1 for NOX1 activation were highly expressed. We next investigated whether NADPH oxidase 1 (NOX1)-derived ROS is closely associated with HT29 cell death induced by E. histolytica. Suppression of Rac1 by siRNA significantly inhibited Entamoeba-induced cell death. Moreover, knockdown of NOX1 by siRNA, effectively inhibited E. histolytica-triggered DNA fragmentation in HT29 cells. These results suggest that NOX1-derived ROS is required for apoptotic cell death in HT29 colon epithelial cells induced by E. histolytica.

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The interaction betweenEntamoeba histolyticaand enterobacteria shed light on an ancient antibacterial response
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NOX4 activation is involved in ROS‐dependent Jurkat T‐cell death induced by Entamoeba histolytica
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Proteomic Analysis of Haptoglobin and Amyloid A Protein Levels in Patients with Vivax Malaria: Young Yil Bahk, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Yeon Kim, Kook-Jin Lim, Tong-Soo Kim; Korean J Parasitol 2010;48(3):203-211.
Published online September 16, 2010; DOI: https://doi.org/10.3347/kjp.2010.48.3.203

Abstract
PDF

Advancements in the field of proteomics have provided great opportunities for the development of diagnostic and therapeutic tools against human diseases. In this study, we analyzed haptoglobin and amyloid A protein levels of vivax malaria patients with combinations of depletion of the abundant plasma proteins, 2-dimensional gel electrophoresis (2-DE), image analysis, and mass spectrometry in the plasma between normal healthy donors and vivax malaria patients. The results showed that the expression level of haptoglobin had become significantly lower or undetectable in the plasma of vivax malaria patients due to proteolytic cleavage when compared to healthy donors on 2-DE gels. Meanwhile, serum amyloid A protein was significantly increased in vivax malaria patient's plasma with high statistical values. These 2 proteins are common acute phase reactants and further large scale evaluation with a larger number of patient's will be necessary to establish the possible clinical meaning of the existential changes of these proteins in vivax malaria patients. However, our proteomic analysis suggests the feasible values of some plasma proteins, such as haptoglobin and serum amyloid A, as associating factor candidates for vivax malaria.

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