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Original Article

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
Korean J Parasitol 2020;58(4):431-443.
Published online August 25, 2020
DOI: https://doi.org/10.3347/kjp.2020.58.4.431
Echinostoma mekongi n. sp. (Digenea: Echinostomatidae) is described based on adult flukes collected from humans residing along the Mekong River in Cambodia. Total 256 flukes were collected from the diarrheic stool of 6 echinostome egg positive villagers in Kratie and Takeo Province after praziquantel treatment and purging. Adults of the new species were 9.0-13.1 (av. 11.3) mm in length and 1.3-2.5 (1.9) mm in maximum width and characterized by having a head collar armed with 37 collar spines (dorsal spines arranged in 2 alternative rows), including 5 end group spines. The eggs in feces and worm uterus were 98-132 (117) μm long and 62-90 (75) μm wide. These morphological features closely resembled those of Echinostoma revolutum, E. miyagawai, and several other 37-collar-spined Echinostoma species. However, sequencing of the nuclear ITS (ITS1-5.8S rRNA-ITS2) and 2 mitochondrial genes, cox1 and nad1, revealed unique features distinct from E. revolutum and also from other 37-collar-spined Echinostoma group available in GenBank (E. bolschewense, E. caproni, E. cinetorchis, E. deserticum, E. miyagawai, E. nasincovae, E. novaezealandense, E. paraensei, E. paraulum, E. robustum, E. trivolvis, and Echinostoma sp. IG). Thus, we assigned our flukes as a new species, E. mekongi. The new species revealed marked variation in the morphology of testes (globular or lobulated), and smaller head collar, collar spines, oral and ventral suckers, and cirrus sac compared to E. revolutum and E. miyagawai. Epidemiological studies regarding the geographical distribution and its life history, including the source of human infections, remain to be performed.

Citations

Citations to this article as recorded by  Crossref logo
  • The Nuclear Ribosomal Transcription Units of Two Echinostomes and Their Taxonomic Implications for the Family Echinostomatidae
    Yu Cao, Ye Li, Zhong-Yan Gao, Bo-Tao Jiang
    Biology.2025; 14(8): 1101.     CrossRef
  • Prevalence of Foodborne Trematodes in Small Indigenous Fish Species in Local Markets of Phnom Penh, Cambodia
    Domenico Caruso, Lin Kong, Samnang Keo, Sreyni Yoeurn, Samphal Seng
    Vector-Borne and Zoonotic Diseases.2024; 24(3): 141.     CrossRef
  • High Prevalence of Echinostoma mekongi Infection in Schoolchildren and Adults, Kandal Province, Cambodia
    Bong-Kwang Jung, Taehee Chang, Seungwan Ryoo, Sooji Hong, Jeonggyu Lee, Sung-Jong Hong, Woon-Mok Sohn, Virak Khieu, Rekol Huy, Jong-Yil Chai
    Emerging Infectious Diseases.2024;[Epub]     CrossRef
  • 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
  • First molecular insights into gastrointestinal helminths of domestic birds in the Caspian Sea Littoral of Iran with an emphasis on the One Health concern
    Aida Vafae Eslahi, Majid Pirestani, Armin Aligolzadeh, Oskar Nowak, Elham Hajialilo, Pourya Fathollahzadeh, Fahimeh Hajiaghaee, Milad Badri, Luís Manuel Madeira de Carvalho
    Veterinary Parasitology: Regional Studies and Reports.2024; 51: 101035.     CrossRef
  • Characterization of Echinostoma spp. (Trematoda: Echinostomatidae Looss, 1899) infecting ducks in south-eastern Australia
    Madeleine Ray, Michael Trinidad, Nidhish Francis, Shokoofeh Shamsi
    International Journal of Food Microbiology.2024; 421: 110754.     CrossRef
  • Genetic diversity and population structure of the helminths intermediate host Anentome helena (von dem Busch, 1847) in northern Thailand
    Nithinan Chomchoei, Chalobol Wongsawad, Preeyaporn Butboonchoo, Nattawadee Nantarat
    Asian Pacific Journal of Tropical Medicine.2024; 17(12): 536.     CrossRef
  • 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
  • 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
  • Neglected food-borne trematodiases: echinostomiasis and gastrodiscoidiasis
    Rafael Toledo, María Álvarez-Izquierdo, J. Guillermo Esteban, Carla Muñoz-Antoli
    Parasitology.2022; 149(10): 1319.     CrossRef
  • General overview of the current status of human foodborne trematodiasis
    Jong-Yil Chai, Bong-Kwang Jung
    Parasitology.2022; 149(10): 1262.     CrossRef
  • Echinostoma mekongi: Discovery of Its Metacercarial Stage in Snails, Filopaludina martensi cambodjensis, in Pursat Province, Cambodia
    Jong-Yil Chai, Woon-Mok Sohn, Jaeeun Cho, Bong-Kwang Jung, Taehee Chang, Keon Hoon Lee, Virak Khieu, Rekol Huy
    The Korean Journal of Parasitology.2021; 59(1): 47.     CrossRef
  • Echinostoma miyagawai Ishii, 1932 (Echinostomatidae) from Ducks in Aceh Province, Indonesia with Special Reference to Its Synonymy with Echinostoma robustum Yamaguti, 1935
    Jong-Yil Chai, Bong-Kwang Jung, Taehee Chang, Hyejoo Shin, Jaeeun Cho, Jin-Youp Ryu, Hyun-Seung Kim, Kwanghoon Park, Mun-Hyoo Jeong, Eui-Hyug Hoang, Marzuki Bin Muhammad Abdullah
    The Korean Journal of Parasitology.2021; 59(1): 35.     CrossRef
  • Acanthoparyphium shinanense n. sp. (Digenea: Echinostomatidae) from Experimental Chicks Infected with Metacercariae Encysted in Brackish Water Clams in the Republic of Korea
    Seungwan Ryoo, Bong-Kwang Jung, Taehee Chang, Sooji Hong, Hyejoo Shin, Jong-Yil Chai
    The Korean Journal of Parasitology.2021; 59(4): 341.     CrossRef
  • Taxonomy of Echinostoma revolutum and 37-Collar-Spined Echinostoma spp.: A Historical Review
    Jong-Yil Chai, Jaeeun Cho, Taehee Chang, Bong-Kwang Jung, Woon-Mok Sohn
    The Korean Journal of Parasitology.2020; 58(4): 343.     CrossRef
  • 7,755 View
  • 148 Download
  • 17 Web of Science
  • Crossref

Brief Communication

Infections with Digenean Trematode Metacercariae in Two Invasive Alien Fish, Micropterus salmoides and Lepomis macrochirus, in Two Rivers in Chungcheongbuk-do, Republic of Korea
Seongjun Choe, Hansol Park, Dongmin Lee, Yeseul Kang, Hyeong-Kyu Jeon, Keeseon S. Eom
Korean J Parasitol 2018;56(5):509-513.
Published online October 31, 2018
DOI: https://doi.org/10.3347/kjp.2018.56.5.509
Present study was performed to survey infection status of digenetic trematode metacercariae in 2 alien fish species, Micropterus salmoides (largemouth bass) and Lepomis macrochirus (bluegill), in 2 rivers draining Chungcheongbuk-do, Republic of Korea. A total of 107 largemouth bass and 244 bluegills were caught in Daecheong-ho (ho=lake) and Musim-cheon (a branch of Geum-gang), in Chungcheongbuk-do April-July 2015. Additionally, 68 native fish of 5 species, i.e., Zacco platypus, Hemibarbus longirostris, Carassius auratus, Pseudogobio esocinus and Puntungia herzi, were caught from the same water bodies. All of the fish collected were examined by artificial digestion method. The metacercariae of Centrocestus armatus, Clinostomum complanatum, Metagonimus sp. and Diplostomum spp. were detected from 4 out of 5 native fish species in Daecheong-ho. However, any metacercariae were not found from 87 M. salmoides and 177 L. macrochirus in Daecheong-ho. In Musim-cheon, metacercariae of Exorchis oviformis and Metacercaria hasegawai were detected from 78% Z. platypus and 34% L. macrochirus, but any metacercariae not found in M. salmoides. We report here that the 2 alien fish species were less infected with the metacercariae than the native ones. Surveys on the metacercariae in the alien fish species in geographically various rivers should be undertaken for better understanding on the role of alien fish species in the trematode infections in Republic of Korea.

Citations

Citations to this article as recorded by  Crossref logo
  • Infection Characteristics of Clonorchis sinensis Metacercariae in Fish from Republic of Korea
    Woon-Mok Sohn
    The Korean Journal of Parasitology.2022; 60(2): 79.     CrossRef
  • Characterization of Fish Assemblages and Standard Length Distributions among Different Sampling Gears Using an Artificial Neural Network
    Tae-Sik Yu, Chang Woo Ji, Young-Seuk Park, Kyeong-Ho Han, Ihn-Sil Kwak
    Fishes.2022; 7(5): 275.     CrossRef
  • Survey of Zoonotic Trematode Metacercariae in Fish from Water Systems of Geum-gang (River) in Republic of Korea
    Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jai-Dong Kim
    The Korean Journal of Parasitology.2021; 59(1): 23.     CrossRef
  • Diagnosis of Centrocestus formosanus Infection in Zebrafish (Danio rerio) in Italy: A Window to a New Globalization-Derived Invasive Microorganism
    Antonino Pace, Ludovico Dipineto, Serena Aceto, Maria Concetta Censullo, Maria Carmen Valoroso, Lorena Varriale, Laura Rinaldi, Lucia Francesca Menna, Alessandro Fioretti, Luca Borrelli
    Animals.2020; 10(3): 456.     CrossRef
  • Infection Status with Clonorchis sinensis Metacercariae in Fish from Yangcheon (Stream) in Sancheong-gun, Gyeongsangnam-do, Korea
    Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju
    The Korean Journal of Parasitology.2019; 57(2): 145.     CrossRef
  • 8,126 View
  • 142 Download
  • 5 Web of Science
  • Crossref

Original Articles

Infections with Centrocestus armatus Metacercariae in Fishes from Water Systems of Major Rivers in Republic of Korea
Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Cheon-Hyeon Kim, Ki-Bok Yoon, Jai-Dong Kim, Dong Cheol Son, Soon-Won Lee
Korean J Parasitol 2018;56(4):341-349.
Published online August 31, 2018
DOI: https://doi.org/10.3347/kjp.2018.56.4.341
The infection status of Centrocestus armatus metacercariae (CaMc) was broadly surveyed in freshwater fishes from major river systems in the Republic of Korea (Korea) during 2008-2017. A total of 14,977 fishes was caught and examined by the artificial digestion method. CaMc were detected in 3,818 (97.1%) (2,114 Z. platypus: 96.1% and 1,704 Z. temminckii: 98.4%) out of 3,932 Zacco spp. examined and their density was 1,867 (2,109 in Z. platypus and 1,567 in Z. temminckii) per fish infected. The prevalences with CaMc were high, 93.7-100%, in Zacco spp. from all surveyed areas. However, their densities were more or less different by the surveyed areas and fish species. They were most high in Nakdong-gang in Gyeongsangnam-do (4,201 in average), and followed by Geum-gang (2,343), Nakdong-gang in Gyeongsangbuk-do (1,623), Han-gang (1,564), Tamjin-gang and Yeongsan-gang (1,540), streams in the east coast (1,028), Seomjin-gang (488) and Mangyeong-gang (170). In another species of rasborinid fish, Opsariichthys uncirostris amurensis, CaMc were detected in 222 (74.8%) out of 297 ones examined and their density was 278 (1-4,480) per fish infected. CaMc were also detected in total 41 fish species except for the rasborinid fish, Z. platypus, Z. temminckii and O. uncirostris amurensis. Conclusively, it was confirmed that among the 3 species of rasborinid fish, Z. platypus and Z. temminckii are highly prevalent and O. uncirostris amurensis is moderately prevalent with CaMc. Additionally, we could know that variety of fish species act as the second intermediate hosts of C. armatus in Korea.

Citations

Citations to this article as recorded by  Crossref logo
  • Survey of Zoonotic Trematode Metacercariae in Fish from Water Systems of Geum-gang (River) in Republic of Korea
    Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jai-Dong Kim
    The Korean Journal of Parasitology.2021; 59(1): 23.     CrossRef
  • Prevalence and Infection Intensity of Zoonotic Trematode Metacercariae in Fish from Soyang-cheon (Stream), in Wanju-gun, Jeollabuk-do, Korea
    Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Jung-Won Ju, Cheon-Hyeon Kim, Min-Ah Hwang, Kyeong-Woo No, Jong-Ho Park
    The Korean Journal of Parasitology.2021; 59(3): 265.     CrossRef
  • Optimization of tools for the detection and identification of Cryptocotyle metacercariae in fish: Digestion method and viability studies
    Maureen Duflot, Graziella Midelet, Odile Bourgau, Kurt Buchmann, Mélanie Gay
    Journal of Fish Diseases.2021; 44(11): 1777.     CrossRef
  • Survey of Zoonotic Trematode Metacercariae in Fish from Irrigation Canal of Togyo-jeosuji (Reservoir) in Cheorwon-gun, Gangwon-do, Republic of Korea
    Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Eun-Joo Lim, Sung Yong Son, Eunmi Ko, Jaeseok Choi
    The Korean Journal of Parasitology.2021; 59(4): 427.     CrossRef
  • Endemicity of Zoonotic Trematode Metacercariae in Fish from Deokcheon-gang (River) in Sancheong-gun, Gyeongsangnam-do, Republic of Korea
    Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Hee Il Lee, Jung-Won Ju, Myoung-Ro Lee, Jeong-Gil Park, Jihee Ahn
    The Korean Journal of Parasitology.2021; 59(5): 523.     CrossRef
  • Diagnosis of Centrocestus formosanus Infection in Zebrafish (Danio rerio) in Italy: A Window to a New Globalization-Derived Invasive Microorganism
    Antonino Pace, Ludovico Dipineto, Serena Aceto, Maria Concetta Censullo, Maria Carmen Valoroso, Lorena Varriale, Laura Rinaldi, Lucia Francesca Menna, Alessandro Fioretti, Luca Borrelli
    Animals.2020; 10(3): 456.     CrossRef
  • Effect of pollutants on biochemical properties of microorganisms
    Oksana V. Boiko, Yu. I. Dotsenko, N. I. Gudinskaya, V. I. Boiko, R. I. Mukhamedzyanova, D. M. Kozak, F. S. Stenkin
    Hygiene and sanitation.2020; 99(4): 368.     CrossRef
  • Effect of pollutants on biochemical properties of microorganisms
    Оксана Витальевна Бойко, Ю. И. Доценко, Н. И. Гудинская, В. И. Бойко, Р. И. Мухамедзянова, Д. М. Козак, Ф. С. Стенькин
    Hygiene and sanitation.2020; 99(4): 368.     CrossRef
  • Infection Status with Digenetic Trematode Metacercariae in Fishes from Coastal Lakes in Gangwon-do, Republic of Korea
    Woon-Mok Sohn, Byoung-Kuk Na, Shin-Hyeong Cho, Soon-Won Lee
    The Korean Journal of Parasitology.2019; 57(6): 681.     CrossRef
  • 9,648 View
  • 102 Download
  • 7 Web of Science
  • Crossref
Subtype Distribution of Blastocystis in Communities along the Chao Phraya River, Thailand
Attakorn Palasuwan, Duangdao Palasuwan, Aongart Mahittikorn, Rachatawan Chiabchalard, Valery Combes, Supaluk Popruk
Korean J Parasitol 2016;54(4):455-460.
Published online August 31, 2016
DOI: https://doi.org/10.3347/kjp.2016.54.4.455
Blastocystis is a common zoonotic enteric protozoan that has been classified into 17 distinct subtypes (STs). A cross-sectional study was conducted to determine the prevalence and subtype distributions of Blastocystis in villagers living along the Chao Phraya River, Ayutthaya Province, Thailand, and to assess the risk of zoonotic infection. In total, 220 stool samples were collected, and DNA was extracted. PCR and sequencing were performed with primers targeting the small-subunit ribosomal RNA (SSU rRNA) genes. Blastocystis was present in 5.9% (13/220) of samples, and ST3 (5.0%; 11/220) was the predominant subtype, followed by ST2 (0.45%; 1/220) and ST6 (0.45%; 1/220). Phylogenetic trees were constructed with the maximum-likelihood method based on the Hasegawa?Kishino?Yano + G + I model, neighbor-joining, and maximum parsimony methods. The percentage of bootstrapped trees in which the associated taxa clustered together was relatively high. All the sequences of the Blastocystis-positive samples (KU051524?KU051536) were closely related to those from animals (pig, cattle, and chicken), indicating a zoonotic risk. Therefore, the villagers require proper health education, especially regarding the prevention of parasitic infection, to improve their personal hygiene and community health. Further studies are required to investigate the Blastocystis STs in the animals living in these villages.

Citations

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  • Assessing Zoonotic Risks of Blastocystis Infection in Singapore
    Thet Tun Aung, Charlotte Kai Qi How, Jean-Marc Chavatte, Nazmi Bin Nazir, Edgar Macabe Pena, Bryan Ogden, Grace Rou’en Lim, Yasmina Arditi Paramastri, Lois Anne Zitzow, Hanrong Chen, Niranjan Nagarajan, Kevin Shyong Wei Tan, Benoit Malleret
    Pathogens.2025; 14(8): 773.     CrossRef
  • Prevalence and subtype distribution of Blastocystis infections among community participants in Thailand: a systematic review and meta-analysis
    Manas Kotepui, Supaluk Popruk, Kwuntida Uthaisar Kotepui, Frederick Ramirez Masangkay, Kinley Wangdi, Aongart Mahittikorn, Christen Rune Stensvold
    Parasite.2025; 32: 53.     CrossRef
  • Blastocystis spp. and Other Intestinal Parasites in Polish Soldiers Deployed to Lebanon and Iraq
    Danuta Izabela Kosik-Bogacka, Krzysztof Korzeniewski, Natalia Łanocha-Arendarczyk, Joanna Korycińska, Małgorzata Lepczyńska, Ewa Dzika, Małgorzata Marchelek-Myśliwiec
    Pathogens.2024; 13(3): 271.     CrossRef
  • Subtype–host patterns and genetic differentiation of Blastocystis sp. in the Philippines
    Davin Edric V. Adao, Windell L. Rivera
    Heliyon.2024; 10(7): e29019.     CrossRef
  • Blastocystis sp.—An emerging cause of diarrhea post stem cell transplantation
    Osman Radhwi, Abdullah Almohammadi, Adel Almarzouki, Ahmed Barefah, Salem Bahashwan, Hatem Alahwal
    Clinical Case Reports.2023;[Epub]     CrossRef
  • Identification Of Gastrointestinal Protozoa Of Swine (Sus sp.) In Surabaya Slaughterhouse In Dry Season
    Amalia Rosydinasari Rosydinasari, Nunuk Dyah Retno Lastuti, Ira Sari Yudaniayanti, Mufasirin
    Journal of Parasite Science.2023; 7(1): 7.     CrossRef
  • Identification and Genetic Characterization of Blastocystis Species in Patients from Makkah, Saudi Arabia
    Majed H Wakid, Waad T Aldahhasi, Muslimah N Alsulami, Asmaa M. El-Kady, Hatem Elshabrawy
    Infection and Drug Resistance.2022; Volume 15: 491.     CrossRef
  • Molecular prevalence and subtype distribution ofBlastocystissp. in Asia and in Australia
    Sara Nemati, Mohammad Reza Zali, Paul Johnson, Hamed Mirjalali, Panagiotis Karanis
    Journal of Water and Health.2021; 19(5): 687.     CrossRef
  • Epidemiology and subtype distribution of Blastocystis in humans: A review
    Supaluk Popruk, Davin Edric V. Adao, Windell L. Rivera
    Infection, Genetics and Evolution.2021; 95: 105085.     CrossRef
  • The Coexistence of Blastocystis spp. in Humans, Animals and Environmental Sources from 2010–2021 in Asia
    Adedolapo Aminat Rauff-Adedotun, Farah Haziqah Meor Termizi, Nurshafarina Shaari, Ii Li Lee
    Biology.2021; 10(10): 990.     CrossRef
  • Prevalence and Subtype Distribution of Blastocystis Infection in Patients with Diabetes Mellitus in Thailand
    Noppon Popruk, Satakamol Prasongwattana, Aongart Mahittikorn, Attakorn Palasuwan, Supaluk Popruk, Duangdao Palasuwan
    International Journal of Environmental Research and Public Health.2020; 17(23): 8877.     CrossRef
  • A SURVEY FOR ZOONOTIC AND OTHER GASTROINTESTINAL PARASITES IN PIG IN BALI PROVINCE, INDONESIA
    Ni Komang Aprilina Widisuputri, Lucia Tri Suwanti, Hani Plumeriastuti
    Indonesian Journal of Tropical and Infectious Disease.2020; 8(1): 55.     CrossRef
  • Identifikasi Molekuler Blastocystis sp. pada Monyet Ekor Panjang (Macaca fascicularis) di Taman Nasional Baluran, Situbondo, Jawa Timur
    Dyah Ayu Kurniawati, Lucia Tri Suwanti, Nunuk Dyah Retno Lastuti, Setiawan Koesdarto, Endang Suprihati, Mufasirin Mufasirin, Arif Pratiwi
    Jurnal Medik Veteriner.2020; 3(2): 138.     CrossRef
  • Prevalence and subtype distribution of Blastocystis in ethnic minority groups on both sides of the China–Myanmar border, and assessment of risk factors
    Baiyan Gong, Xiaohua Liu, Yanchen Wu, Ning Xu, Meng Xu, Fengkun Yang, Lei Tong, Kexin Zhou, Jianping Cao, Aiqin Liu, Yujuan Shen
    Parasite.2019; 26: 46.     CrossRef
  • Blastocystis subtypes detected in long-tailed macaques in Thailand—Further evidence of cryptic host specificity
    Kotchaphon Vaisusuk, Weerachai Saijuntha, Sutthira Sedlak, Thongchit Thanchomnang, Warayutt Pilap, Warong Suksavate, Christen Rune Stensvold, Chairat Tantrawatpan
    Acta Tropica.2018; 184: 78.     CrossRef
  • Blastocystis genetic diversity among children of low-income daycare center in Southeastern Brazil
    Ana Paula Oliveira-Arbex, Érica Boarato David, Semíramis Guimarães
    Infection, Genetics and Evolution.2018; 57: 59.     CrossRef
  • High diversity of Blastocystis subtypes isolated from asymptomatic adults living in Chiang Rai, Thailand
    Amara Yowang, Anastasios D. Tsaousis, Tawatchai Chumphonsuk, Nontaphat Thongsin, Niwed Kullawong, Siam Popluechai, Eleni Gentekaki
    Infection, Genetics and Evolution.2018; 65: 270.     CrossRef
  • Blastocystis infection and subtype distribution in humans, cattle, goats, and pigs in central and western Thailand
    Ruenruetai Udonsom, Rapeepan Prasertbun, Aongart Mahittikorn, Hirotake Mori, Tanasak Changbunjong, Chalit Komalamisra, Ai-rada Pintong, Yaowalark Sukthana, Supaluk Popruk
    Infection, Genetics and Evolution.2018; 65: 107.     CrossRef
  • Blastocystis subtype 5: Predominant subtype on pig farms, Thailand
    Ai-rada Pintong, Suparat Sunyanusin, Rapeepan Prasertbun, Aongart Mahittikorn, Hirotake Mori, Tanasak Changbunjong, Chalit Komalamisra, Yaowalark Sukthana, Supaluk Popruk
    Parasitology International.2018; 67(6): 824.     CrossRef
  • First genotyping of Blastocystis sp. in dairy, meat, and cashmere goats in northwestern China
    Jun-Ke Song, Yan-Ling Yin, Ya-Jie Yuan, Huan Tang, Guan-Jing Ren, Hui-Jun Zhang, Zi-Xuan Li, Yan-Ming Zhang, Guang-Hui Zhao
    Acta Tropica.2017; 176: 277.     CrossRef
  • 10,674 View
  • 194 Download
  • 18 Web of Science
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Brief Communication

Prevalence of Clonorchis sinensis Infection among Residents along 5 Major Rivers in the Republic of Korea
Young-Il Jeong, Hee-Eun Shin, Sang-Eun Lee, Hyeng-Il Cheun, Jung-Won Ju, Jung-Yeon Kim, Mi Yeoun Park, Shin-Hyeong Cho
Korean J Parasitol 2016;54(2):215-219.
Published online April 30, 2016
DOI: https://doi.org/10.3347/kjp.2016.54.2.215
Clonorchis sinensis is currently the most important parasite affecting public health problems in the Republic of Korea. We investigated the prevalence of C. sinensis infection among residents living along 5 major rivers in Korea. A total of 42,562 individual stool samples were collected from 37 localities and examined using the formalin-ether sedimentation technique. Helminth eggs were detected in 4,052 (9.5%) residents and 3,586 (8.4%) were infected with C. sinensis. The egg positive rate of C. sinensis in Nakdong, Seomjin, Geum, Yeongsan, and Han River was 11.7%, 9.9%, 6.5%, 3.1%, and 1.0%, respectively. The overall prevalence of clonorchiasis by sex was 11.2% in males and 6.2% in females. The age-prevalence was the highest in the 50-59 years band. It has been reconfirmed that the endemicity of clonorchiasis is higher in southern areas of Korea, especially along Nakdong and Seomjin Rivers. A combination of continuous control programs with health education initiatives is urgently required in these highly endemic areas of clonorchiasis in Korea.

Citations

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    Seonjeong Woo, Youngun Kim, Sohyun Hwang, Hong Jae Chon
    Journal of Liver Cancer.2025; 25(1): 41.     CrossRef
  • Carcinogenic parasites: insights into the epidemiology and possible mechanisms of cancer
    Shabir Ahmad Rather, Zahoor Ahmad Wani, Rashaid Ali Mustafa, Pooja Bharti, Rukhsana Kousar, Mohammad Vikas Ashraf, Shoeb Ahmad, A A Shah, M A Hannan Khan
    Mutagenesis.2025; 40(3): 465.     CrossRef
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Original Articles

Zoonotic Intestinal Trematodes in Stray Cats (Felis catus) from Riverside Areas of the Republic of Korea
Sung-Shik Shin, Dae-Sung Oh, Kyu-Sung Ahn, Shin-Hyeong Cho, Won-Ja Lee, Byoung-Kuk Na, Woon-Mok Sohn
Korean J Parasitol 2015;53(2):209-213.
Published online April 22, 2015
DOI: https://doi.org/10.3347/kjp.2015.53.2.209
The present study was performed to survey the infection status of zoonotic intestinal trematode (ZIT) in stray cats from 5 major riverside areas in the Republic of Korea. Total 400 stray cats were captured with live-traps in riverside areas of Seomjingang (‘gang’ means river) (203 cats) from June to October 2010, and of Yeongsangang (41), Nakdonggang (57), Geumgang (38), and Hangang (61 cats) from June to October 2011, respectively. Small intestines resected from cats were opened with a pair of scissors in a beaker with 0.85% saline and examined with naked eyes and under a stereomicroscope. More than 16 ZIT species were detected in 188 (92.6%) cats from Seomjingang areas, and the number of worms recovered was 111 per cat infected. In cats from riverside areas of Yeongsangang, Nakdonggang, Geumgang, and Hangang, more than 9, 8, 3, and 5 ZIT species were recovered, and the worm burdens were 13, 42, 11, and 56 specimens per infected cat, respectively. As the members of family Heterophyidae, more than 10 species, i.e., Metagonimus spp., Pygidiopsis summa, Heterophyes nocens, Stellantchasmus falcatus, Heterophyopsis continua, Acanthotrema felis, Centrocestus armatus, Procerovum varium, Cryptocotyle concava, and Stictodora lari, were recovered. More than 5 species of echinostomes, i.e., Echinostoma hortense, Echinochasmus japonicus, Echinochasmus sp., Echinoparyphium sp., and unidentified larval echinostomes, were collected. Plagiorchis spp. were detected in cats from areas of Seomjin-gang and Yeongsangang. From the above results, it has been confirmed that stray cats in 5 major riverside areas of Korea are highly infected with various species of ZITs.

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  • Infections of Two Isthmiophora Species (Digenea: Echinostomatidae) in Wild Mammals from Republic of Korea with Their Morphological Descriptions
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  • Infections with Centrocestus armatus Metacercariae in Fishes from Water Systems of Major Rivers in Republic of Korea
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  • Infection Status of Isthmiophora hortensis Metacercariae in Dark Sleepers, Odontobutis Species, from Some Water Systems of the Republic of Korea
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  • Fishborne zoonotic heterophyid infections: An update
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  • New Definitive Hosts and Differential Body Indices of Isthmiophora hortensis (Digenea: Echinostomatidae)
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Prevalence and Risk Factors of Clonorchiasis among Residents of Riverside Areas in Muju-gun, Jeollabuk-do, Korea
Do-Soon Park, Sung-Jin Na, Shin Hyeong Cho, Kyung Ja June, Young-Chae Cho, Young-Ha Lee
Korean J Parasitol 2014;52(4):391-397.
Published online August 29, 2014
DOI: https://doi.org/10.3347/kjp.2014.52.4.391

We evaluated the status of Clonorchis sinensis infection and potential risk factors among residents of riverside areas (Geumgang) in Muju-gun, Jeollabuk-do (Province), Korea. From January to February 2010, a total of 349 (171 males, 178 females) stool samples were collected and examined by the formalin-ether concentration technique. Also, village residents were interviewed using questionnaires to obtain information about C. sinensis infection-related risk factors. Overall egg-positive rate of C. sinensis was 13.2%. Egg-positive rates were significantly higher in males, farmers, and residents who had lived there more than 20 years, and in residents who had eaten raw freshwater fish than in opposite groups, respectively. However, there was no significant difference between age groups, education levels, cigarette smoking, alcohol drinking, health status, past history of infection, and experience of clonorchiasis medication and examination. Logistic regression analysis was performed to determine risk factors for clonorchiasis. On univariate analysis, the odds ratios for males, farmers, those who had lived there more than 20 years, and who had eaten raw freshwater fish were 2.41, 4.44, 3.16, and 4.88 times higher than those of the opposites, respectively. On multivariate analysis, the odds ratio of residents who had eaten raw freshwater fish was 3.2-fold higher than that of those who had not. These results indicate that residents living in Muju-gun, along the Geum River, Korea, have relatively high C. sinensis egg-positive rates, and the habit of eating raw freshwater fish was the major factor for the maintenance of clonorchiasis.

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A Survey of Cryptosporidium Oocysts in Water Supplies during a 10-Year Period (2000-2009) in Seoul
Mok Young Lee, Eun Joo Cho, Jin Hyo Lee, Sun Hee Han, Yong Sang Park
Korean J Parasitol 2010;48(3):219-224.
Published online September 16, 2010
DOI: https://doi.org/10.3347/kjp.2010.48.3.219

This study has been conducted to estimate the occurrence of Cryptosporidium oocysts in water supplies in the Metropolitan area of Seoul, South Korea, for 10 years from 2000 to 2009. Water samples were collected quarterly at 6 intakes in the Han River and its largest stream and 6 conventional Water Treatment Plants (WTPs) serving drinking water for 10 million people of Seoul. Cryptosporidium oocysts were found in 22.5% of intake water samples and arithmetic mean was 0.65 oocysts/10 L (range 0-22 oocysts/10 L). Although the annual mean of oocyst number was as low as 0.04-1.90 oocysts/10 L, 3 peaks in 2004 and 2007 were observed and the pollution level was a little higher in winter. The lowest density was observed at Paldang intake and the pollution level increased at Kuui and Jayang intakes. At the end of the largest stream, oocysts were found in 70% of collected samples (mean 5.71 oocysts/10 L) and it seemed that its joining the Han River resulted in the increase at Kuui intake and downstream. Oocyst removal by physical process exceeded 2.0-2.3 log and then all finished water samples collected at 6 WTPs were negative for Cryptosporidium in each 100 L sample for 10 years. These results suggested that domestic wastewater from the urban region could be a source of Cryptosporidium pollution and separating sewage systems adjacent to the intakes could be meaningful for some intakes having weakness related to parasitological water quality.

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Brief Communication
Decrease of Metagonimus yokogawai Endemicity along the Tamjin River Basin
Jin-Ju Lee, Hyo-Jin Kim, Min-Jae Kim, Jo Woon Yi Lee, Bong-Kwang Jung, Ji-Youn Lee, Eun-Hee Shin, Jae-Lip Kim, Jong-Yil Chai
Korean J Parasitol 2008;46(4):289-291.
Published online December 20, 2008
DOI: https://doi.org/10.3347/kjp.2008.46.4.289

The Tamjin River which flows from Jangheung-gun via Gangjin-gun to the South Sea was reported to be a highly endemic area of Metagonimus yokogawai infection in 1977 and 1985. However, there were no recent studies demonstrating how much change occurred in the endemicity, in terms of prevalence and worm burden, of metagonimiasis in this river basin. Thus, a small-scale epidemiological survey was carried out on some residents along the Tamjin River basin in order to determine the current status of M. yokogawai infection. A total of 48 fecal samples were collected and examined by the Kato-Katz thick smear and formalin-ether sedimentation techniques. The egg positive rate of all helminths was 50.0%, and that of M. yokogawai was 37.5%, followed by C. sinensis 22.9% and G. seoi 4.2%. To obtain the adult flukes of M. yokogawai, 6 egg positive cases were treated with praziquantel 10 mg/kg in a single dose and purged with magnesium sulfate. A total of 5,225 adult flukes (average 871 specimens per person) of M. yokogawai were collected from their diarrheic stools. Compared with the data reported in 1977 and 1985, the individual worm burdens appeared to have decreased remarkably, although the prevalence did not decrease at all. It is suggested that the endemicity of M. yokogawai infection along the Tamjin River has been reduced. To confirm this suggestion, the status of infection in snail and fish intermediate hosts should be investigated.

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