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Brief Communications

Prevalence and Intensity of Opisthorchis viverrini Metacercarial Infection in Fish from Phnom Penh, Takeo, and Kandal Provinces, Cambodia
Woon-Mok Sohn, Seung-Ho Choi, Bong-Kwang Jung, Sooji Hong, Seungwan Ryoo, Taehee Chang, Keon Hoon Lee, Byoung-Kuk Na, Sung-Jong Hong, Virak Khieu, Jong-Yil Chai
Korean J Parasitol 2021;59(5):531-536.
Published online October 22, 2021
DOI: https://doi.org/10.3347/kjp.2021.59.5.531
The prevalence and intensity of Opisthorchis viverrini metacercariae (OvMc) were investigated in fish from 3 southern administrative regions along the Mekong River in Cambodia, i.e., Phnom Penh, Takeo, and Kandal Provinces from 2017 to 2020. A total of 295 freshwater fish (24 species) were transported to our laboratory with ice and examined using the artificial digestion method. In Phnom Penh, among 4 fish species positive for OvMc, 9 (23.7%) of 38 specimens examined were infected, and their intensity of infection averaged 4.3 metacercariae per infected fish. In Takeo Province, among 10 fish species positive for OvMc, 24 (38.1%) out of 63 fish examined were infected, and their intensity of infection was av. 14.4 metacercariae per infected fish. In particular, all of 3 Osteochilus schlegelii fish examined were infected, and their infection intensity was high, 34.7 metacercariae per fish. In Kandal Province, among 6 fish species positive for OvMc, 46 (90.2%) out of 51 specimens examined were infected, and their infection intensity was 24.0 metacercaraie per infected fish. All fish of Systomus orphoides (n=17), Barbonymus altus (n=14), and Rasbora aurotaenia (n=2) were infected, and their intensity of infection averaged 37.7, 21.6, and 18.5 metacercariae per fish, respectively. Metacercariae of Haplochis yokogawai, Haplorchis taichui, and Centrocestus formosanus were detected in fish from Takeo and Kandal Provinces. From these results, it has been confirmed that a variety of fish species from Phnom Penh, Takeo, and Kandal Provinces are commonly infected with OvMc, and preventive measures to avoid human O. viverrini infection should be performed in Cambodia.

Citations

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  • Biological Hazards and Indicators Found in Products of Animal Origin in Cambodia from 2000 to 2022: A Systematic Review
    Shwe Phue San, Rortana Chea, Delia Grace, Kristina Roesel, Sothyra Tum, Stephen Young, Tumnoon Charaslertrangsi, Nazanin Zand, Shetty Seetharama Thombathu, Ra Thorng, Leab Kong, Kuok Fidero, Linda Nicolaides
    International Journal of Environmental Research and Public Health.2024; 21(12): 1621.     CrossRef
  • Re‐evaluation of certain aspects of the EFSA Scientific Opinion of April 2010 on risk assessment of parasites in fishery products, based on new scientific data. Part 2
    Ana Allende, Avelino Alvarez‐Ordóñez, Valeria Bortolaia, Sara Bover‐Cid, Alessandra De Cesare, Wietske Dohmen, Laurent Guillier, Lieve Herman, Liesbeth Jacxsens, Maarten Nauta, Lapo Mughini‐Gras, Jakob Ottoson, Luisa Peixe, Fernando Perez‐Rodriguez, Panag
    EFSA Journal.2024;[Epub]     CrossRef
  • 5,683 View
  • 110 Download
  • 2 Web of Science
  • Crossref
Detection of Gnathostoma spinigerum Advanced 3rd-Stage Larvae in the Chinese Edible Frog, Hoplobatrachus rugulosus, from Local Markets in Phnom Penh, Cambodia
Woon-Mok Sohn, Bong-Kwang Jung, Sooji Hong, Seungwan Ryoo, Keon Hoon Lee, Virak Khieu, Jong-Yil Chai
Korean J Parasitol 2021;59(5):519-522.
Published online October 22, 2021
DOI: https://doi.org/10.3347/kjp.2021.59.5.519
The Chinese edible frogs, Hoplobatrachus rugulosus (n=20), and the striped snakehead fish, Channa striata (n=34), were purchased from local markets in 3 administrative regions of Cambodia (Phnom Penh, Pursat, and Takeo Provinces) from May 2017 to April 2019, and their infection status with Gnathostoma sp. larvae was investigated. The frogs and fish were transported to the laboratory with ice and examined using the artificial digestion method. Advanced 3rd-stage larvae (AdL3) of Gnathostoma spinigerum, 24 in total number (1-6 larvae/frog), were detected from 6 (60.0%) out of 10 frogs purchased from Phnom Penh. No gnathostome larvae were detected in 10 frogs purchased from Takeo Province and 34 snakeheads from Phnom Penh, Pursat, and Takeo Provinces. AdL3 isolated from the frogs were 2.55- 3.90 mm long and 0.31-0.36 mm wide. They had a characteristic head bulb (0.081×0.191 mm in average size) with 4 rows of hooklets, a muscular long esophagus (0.950-1.230 mm long), and 2 pairs of cervical sacs (0.530-0.890 mm long). The average number of hooklets in the 1st, 2nd, 3rd, and 4th rows was 41, 45, 48, and 51, respectively. These features were consistent with G. spinigerum AdL3. By the present study, it has been first confirmed that the Chinese edible frog, H. rugulosus, from Phnom Penh serves as a second intermediate host for G. spinigerum, although their intensity of infection was not so high compared to other previously reported localities.

Citations

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  • A Global Review of the Zoonotic Potential and Disease Risks of Amphibian Parasites in Bullfrog Aquaculture
    Meiqi Weng, Xinhua Liu, Chenxi Zhang, Rui Shu, Andrew Wang, Haotian Zhang, Xingqiang Wang, Huirong Yang, Jinyong Zhang
    Reviews in Aquaculture.2025;[Epub]     CrossRef
  • Zoonotic disease risk at traditional food markets
    Frida E. Sparaciari, Cadhla Firth, Erik A. Karlsson, Paul F. Horwood, Suchetana Mukhopadhyay
    Journal of Virology.2025;[Epub]     CrossRef
  • Biological Hazards and Indicators Found in Products of Animal Origin in Cambodia from 2000 to 2022: A Systematic Review
    Shwe Phue San, Rortana Chea, Delia Grace, Kristina Roesel, Sothyra Tum, Stephen Young, Tumnoon Charaslertrangsi, Nazanin Zand, Shetty Seetharama Thombathu, Ra Thorng, Leab Kong, Kuok Fidero, Linda Nicolaides
    International Journal of Environmental Research and Public Health.2024; 21(12): 1621.     CrossRef
  • 4,087 View
  • 67 Download
  • 2 Web of Science
  • Crossref
Occurrence of a Hybrid Between Taenia saginata and Taenia asiatica Tapeworms in Cambodia
Taehee Chang, Bong-Kwang Jung, Sooji Hong, Hyejoo Shin, Seungwan Ryoo, Jeonggyu Lee, Keon Hoon Lee, Hansol Park, Keeseon S. Eom, Virak Khieu, Rekol Huy, Woon-Mok Sohn, Jong-Yil Chai
Korean J Parasitol 2021;59(2):179-182.
Published online April 22, 2021
DOI: https://doi.org/10.3347/kjp.2021.59.2.179
Human infection with Taenia asiatica or a hybrid between Taenia saginata and T. asiatica has not been reported in Cambodia. We detected for the first time a hybrid form between T. saginata and T. asiatica in Preah Vihear Province, Cambodia. An adult tapeworm specimen, i.e., 75 cm long strobila without scolex, was expelled from a 27-year-old man after praziquantel medication and purging. It was morphologically indistinguishable between T. saginata and T. asiatica. Several proglottids were molecularly analyzed to confirm the tapeworm species. The mitochondrial gene encoding cytochrome c oxidase subunit 1 (cox1) and nuclear genes encoding elongation factor-1α (ef1) and ezrin-radixin-moesin (ERM)-like protein (elp) were sequenced, and a single-allele analysis was performed to confirm the haploid genotype. The results revealed that our sample showed a discrepancy between the mitochondrial and 2 nuclear genes. It possessed homozygous sequences typical of T. saginata at cox1 and ef1 loci. However, it was heterozygous at the elp locus, with 1 allele in T. asiatica (elpA) and 1 in T. saginata (elpC), which indicates that it is a hybrid between T. saginata and T. asiatica. The present results confirmed the presence of a hybrid between T. saginata and T. asiatica in Cambodia and strongly suggest the existence of also ‘pure’ T. asiatica in Cambodia.

Citations

Citations to this article as recorded by  Crossref logo
  • Molecular Identification and Appraisal of the Genetic Variation of Taenia saginata in Central Regions of Vietnam
    Giang Tran Thi, Ilenia Azzena, Fabio Scarpa, Piero Cossu, Cong Danh Le, Phuong Anh Ton Nu, Thi Minh Chau Ngo, Daria Sanna, Marco Casu
    Life.2022; 12(1): 70.     CrossRef
  • Case Report: Molecular Diagnosis Revealing an Intestinal Infection of a Hybridized Tapeworm (Taenia saginata and Taenia asiatica) to Human in Yunnan, China
    Kan-Kan Chu, Ye Qiu, Ce-Heng Liao, Zhi You, Zuo-Shun He, Wen Fang, Hong-Ying Li, Peter Daszak, Jun-Jie Hu, Yun-Zhi Zhang, Xing-Yi Ge
    Frontiers in Gastroenterology.2022;[Epub]     CrossRef
  • 5,435 View
  • 102 Download
  • 2 Web of Science
  • Crossref

Original Article

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
Korean J Parasitol 2021;59(1):47-53.
Published online February 19, 2021
DOI: https://doi.org/10.3347/kjp.2021.59.1.47
Echinostoma mekongi was reported as a new species in 2020 based on specimens collected from humans in Kratie and Takeo Province, Cambodia. In the present study, its metacercarial stage has been discovered in Filopaludina martensi cambodjensis snails purchased from a local market nearby the Tonle Sap Lake, Pursat Province, Cambodia. The metacercariae were fed orally to an experimental hamster, and adult flukes were recovered at day 20 post-infection. They were morphologically examined using light and scanning electron microscopes and molecularly analyzed by sequencing of their mitochondrial cox1 and nad1 genes. A total of 115 metacercariae (1-8 per snail) were detected in 60 (60.0%) out of 100 Filopaludina snails examined. The metacercariae were round, 174 ?m in average diameter (163-190 ?m in range), having a thin cyst wall, a head collar armed with 37 collar spines, and characteristic excretory granules. The adult flukes were elongated, ventrally curved, 7.3 (6.4-8.2)×1.4 (1.1-1.7) mm in size, and equipped with 37 collar spines on the head collar (dorsal spines in 2 alternating rows), being consistent with E. mekongi. In phylogenetic analyses, the adult flukes showed 99.0-100% homology based on cox1 sequences and 98.9-99.7% homology based on nad1 sequences with E. mekongi. The results evidenced that F. martensi cambodjensis snails act as the second intermediate host of E. mekongi, and hamsters can be used as a suitable experimental definitive host. As local people favor to eat undercooked snails, these snails seem to be an important source of human infection with E. mekongi in Cambodia.

Citations

Citations to this article as recorded by  Crossref logo
  • 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
  • Biological Hazards and Indicators Found in Products of Animal Origin in Cambodia from 2000 to 2022: A Systematic Review
    Shwe Phue San, Rortana Chea, Delia Grace, Kristina Roesel, Sothyra Tum, Stephen Young, Tumnoon Charaslertrangsi, Nazanin Zand, Shetty Seetharama Thombathu, Ra Thorng, Leab Kong, Kuok Fidero, Linda Nicolaides
    International Journal of Environmental Research and Public Health.2024; 21(12): 1621.     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
  • 5,472 View
  • 129 Download
  • 5 Web of Science
  • Crossref

Brief Communication

Infection Status of Gnathostoma spinigerum Larvae in Asian Swamp Eels, Monopterus albus, Purchased from Local Markets in Cambodia
Jong-Yil Chai, Bong-Kwang Jung, Keon Hoon Lee, Sung-Jong Hong, Virak Khieu, Byoung-Kuk Na, Woon-Mok Sohn
Korean J Parasitol 2020;58(6):695-699.
Published online December 29, 2020
DOI: https://doi.org/10.3347/kjp.2020.58.6.695
Present study was performed to know the infection status of Gnathostoma sp. larvae in swamp eels from Cambodia. We purchased total 30 Asian swamp eels, Monopterus albus, from local markets in Pursat and Takeo Provinces and Phnom Penh on May and November 2017 and May 2018. All collected eels were transferred to our laboratory with ice and each of them was examined by artificial digestion method. A total of 15 larval gnathostomes (1-5 larvae) were detected from 55.6% (5/9) swamp eels in Pursat Province. No larval gnathostomes were found in 21 swamp eels in Takeo Province and Phnom Penh. The advanced third-stage larvae (AdL3) detected were 2.575-3.825 (3.250) mm in length and 0.375-0.425 (0.386) mm in width. They had the characteristic head bulb (av. 0.104×0.218 mm) with 4 rows of hooklets, long muscular esophagus (1.048 mm), and 2 pairs of cervical sacs (0.615 mm). The number of hooklets in 4 rows on the head bulb was 41, 44, 47, and 50. In scanning electron microscopy, characteristic features were 4 rows of hooklets on the head bulb, cervical papillae, tegumental spines regularly arranged in transverse striations, and anus. The larval gnathostomes were identified as AdL3 of Gnathostoma spinigerum based on the morphological characters. By the present study, it has been confirmed that G. spinigerum larvae are infected in Asian swamp eels, M. albus, in Pursat Province, Cambodia.

Citations

Citations to this article as recorded by  Crossref logo
  • Biological Hazards and Indicators Found in Products of Animal Origin in Cambodia from 2000 to 2022: A Systematic Review
    Shwe Phue San, Rortana Chea, Delia Grace, Kristina Roesel, Sothyra Tum, Stephen Young, Tumnoon Charaslertrangsi, Nazanin Zand, Shetty Seetharama Thombathu, Ra Thorng, Leab Kong, Kuok Fidero, Linda Nicolaides
    International Journal of Environmental Research and Public Health.2024; 21(12): 1621.     CrossRef
  • Intracameral Gnathostomiasis: A Case Report and Literature Review
    Wijak Kongwattananon, Thanaporn Wiriyabanditkul, Waraluck Supwatjariyakul, Thanapong Somkijrungroj
    Ocular Immunology and Inflammation.2023; 31(5): 1092.     CrossRef
  • Detection of Gnathostoma spinigerum Advanced 3rd-Stage Larvae in the Chinese Edible Frog, Hoplobatrachus rugulosus, from Local Markets in Phnom Penh, Cambodia
    Woon-Mok Sohn, Bong-Kwang Jung, Sooji Hong, Seungwan Ryoo, Keon Hoon Lee, Virak Khieu, Jong-Yil Chai
    The Korean Journal of Parasitology.2021; 59(5): 519.     CrossRef
  • 5,504 View
  • 121 Download
  • 2 Web of Science
  • Crossref

Original Articles

Morphological and Molecular Diagnosis of Necator americanus and Ancylostoma ceylanicum Recovered from Villagers in Northern Cambodia
Taehee Chang, Bong-Kwang Jung, Woon-Mok Sohn, Sooji Hong, Hyejoo Shin, Seungwan Ryoo, Jeonggyu Lee, Keon Hoon Lee, Virak Khieu, Rekol Huy, Jong-Yil Chai
Korean J Parasitol 2020;58(6):619-625.
Published online December 29, 2020
DOI: https://doi.org/10.3347/kjp.2020.58.6.619
Human hookworm infections caused by adult Ancylostoma spp. and Necator americanus are one of the most important tropical diseases. We performed a survey of intestinal helminths using the Kato-Katz fecal examination technique targeting 1,156 villagers residing in 2 northern provinces (Preah Vihear and Stung Treng) of Cambodia in 2018. The results revealed a high overall egg positive rate of intestinal helminths (61.9%), and the egg positive rate of hookworms was 11.6%. Nine of the hookworm egg positive cases in Preah Vihear Province were treated with 5-10 mg/kg pyrantel pamoate followed by purging with magnesium salts, and a total of 65 adult hookworms were expelled in diarrheic stools. The adult hookworms were analyzed morphologically and molecularly to confirm the species. The morphologies of the buccal cavity and dorsal rays on the costa were observed with a light microscope, and the nucleotide sequences of mitochondrial cytochrome c oxidase subunit 1 (cox1) gene were analyzed. The majority of the hookworm adults (90.7%) were N. americanus, whereas the remaining 9.3% were Ancylostoma ceylanicum, a rare hookworm species infecting humans. The results revealed a high prevalence of hookworm infections among people in a northern part of Cambodia, suggesting the necessity of a sustained survey combined with control measures against hookworm infections.

Citations

Citations to this article as recorded by  Crossref logo
  • The occurrence of cross-host species soil-transmitted helminth infections in humans and domestic/livestock animals: A systematic review
    Uniqueky Gratis Mawrie, Riviarynthia Kharkongor, María Martínez Valladares, Stella Kepha, Sitara S. R. Ajjampur, Rajiv Sarkar, Rachel Pullan, Muhammad Asaduzzaman
    PLOS Global Public Health.2025; 5(8): e0004614.     CrossRef
  • Hookworm infections in carnivores in Iran: a One Health concern
    Meysam Sharifdini, Aida Vafae Eslahi, Majid Pirestani, Ali Asghari, Giovanni Sgroi, Elham Hajialilo, Arian Ghannadi Karimi, Anastasia Diakou, Milad Badri
    BMC Veterinary Research.2025;[Epub]     CrossRef
  • Integrated Eco-Health approach significantly reduces helminth infections in endemic Khong islands with emphasis on Schistosoma mekongi
    Somphou Sayasone, Youthanavanh Vonghachack, Shang Xia, Shan Lv, Xiao-Nong Zhou, Peter Odermatt
    Infectious Diseases of Poverty.2024;[Epub]     CrossRef
  • Prevention of Ancylostomiasis Transmission in Livestock and Stockmen with Good Hygiene Behavior and Cage Sanitation
    Meiningtiyas Indriyanti, Sayono Sayono, Wahyu Handoyo, Tri Dewi Kristini, Didik Sumanto
    International Journal of Medical Parasitology and Epidemiology Sciences.2024; 5(1): 11.     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
  • Hookworm infection in central China: morphological and molecular diagnosis
    Fang Fang Xu, Yu Fei Niu, Wen Qing Chen, Sha Sha Liu, Jing Ru Li, Peng Jiang, Zhong Quan Wang, Jing Cui, Xi Zhang
    Parasites & Vectors.2021;[Epub]     CrossRef
  • 8,426 View
  • 216 Download
  • 5 Web of Science
  • 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
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

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  • 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
  • 7,561 View
  • 148 Download
  • 17 Web of Science
  • Crossref

Brief Communications

Molecular Diagnosis of Taenia saginata Tapeworms from Two Residents of Northern Cambodia
Taehee Chang, Bong-Kwang Jung, Woon-Mok Sohn, Sooji Hong, Hyejoo Shin, Seungwan Ryoo, Jeonggyu Lee, Keon Hoon Lee, Virak Khieu, Rekol Huy, Jong-Yil Chai
Korean J Parasitol 2020;58(2):201-204.
Published online April 30, 2020
DOI: https://doi.org/10.3347/kjp.2020.58.2.201
Taenia saginata infection has seldom been reported in Cambodia. In this study, we performed a survey of intestinal parasites in 1,156 residents of Preah Vihear and Stung Treng Provinces in 2018. The results revealed that 26 (2.4%) cases were positive for Taenia spp. eggs. In order to obtain the strobilae of the tapeworms, 2 patients in Preah Vihear were treated with praziquantel and purged with magnesium salts. The proglottids expelled after the medication were morphologically and molecularly analyzed to determine the species. The main uterine lateral braches in gravid proglottids were >15 in number suggesting that they are either T. saginata or Taenia asiatica. The sequences of the mitochondrial cytochrome c oxidase subunit 1 (cox1) gene and 2 nuclear loci, elongation factor-1 alpha (ef1) and ezrin-radixin-moesin-like protein (elp), were identical to the sequences of T. saginata available in GenBank but distant from Taenia solium, T. asiatica, and T. saginata-T. asiatica hybrid. This is the first report of the presence of T. saginata in the northern part of Cambodia bordering Lao PDR based on a molecular confirmation.

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    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
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  • Occurrence of a Hybrid Between Taenia saginata and Taenia asiatica Tapeworms in Cambodia
    Taehee Chang, Bong-Kwang Jung, Sooji Hong, Hyejoo Shin, Seungwan Ryoo, Jeonggyu Lee, Keon Hoon Lee, Hansol Park, Keeseon S. Eom, Virak Khieu, Rekol Huy, Woon-Mok Sohn, Jong-Yil Chai
    The Korean Journal of Parasitology.2021; 59(2): 179.     CrossRef
  • Morphological and Molecular Diagnosis of Necator americanus and Ancylostoma ceylanicum Recovered from Villagers in Northern Cambodia
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    The Korean Journal of Parasitology.2020; 58(6): 619.     CrossRef
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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
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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Stellantchasmus falcatus (Digenea: Heterophyidae) in Cambodia: Discovery of Metacercariae in Mullets and Recovery of Adult Flukes in an Experimental Hamster
Jong-Yil Chai, Woon-Mok Sohn, Byoung-Kuk Na, Hoo-Gn Jeoung, Muth Sinuon, Duong Socheat
Korean J Parasitol 2016;54(4):537-541.
Published online August 31, 2016
DOI: https://doi.org/10.3347/kjp.2016.54.4.537
Stellantchasmus falcatus (Digenea: Heterophyidae) is first reported from Cambodia through recovery of the metacercariae from mullet fish and adult flukes from an experimentally infected hamster. We purchased 7 mullets, Chelon macrolepis, in a local market of Phnom Penh, Cambodia, and each of them was examined by the artificial digestion method on May 2010. The metacercariae of S. falcatus were detected in all mullets (100%) examined, and their average density was 177 per fish. They were elliptical, 220×168 μm in average size. They were orally infected to an hamster to obtain adult flukes. Adults recovered at day 10 post infection were observed with a light microscope and a scanning electron microscope (SEM). They were small, 450×237 μm in average size, had a small oral sucker (41×50 μm), subglobular pharynx (29×21 μm), slender esophagus (57 μm), long and thick-walled expulsor (119×32 μm), spherical ovary (58×69 μm), and 2 ovoid testes (right: 117×74 μm; left: 114×63 μm). Eggs were small, yellow, and 23×12 μm in average size. In SEM observations, tegumental spines were densely distributed on the whole tegument, and single small type I sensory papillae were distributed around the lip of oral sucker. The small ventral sucker was dextrally located and had 8 type I sensory papillae on the left margin. It has been first confirmed in the present study that the mullet, C. macrolepis, is playing the role of a second intermediate host of S. falcatus in Cambodia.

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    Maureen Duflot, Graziella Midelet, Odile Bourgau, Kurt Buchmann, Mélanie Gay
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    Maureen Duflot, Mélanie Gay, Graziella Midelet, Per Walter Kania, Kurt Buchmann
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  • Prevalence and Intensity of Opisthorchis viverrini Metacercarial Infection in Fish from Phnom Penh, Takeo, and Kandal Provinces, Cambodia
    Woon-Mok Sohn, Seung-Ho Choi, Bong-Kwang Jung, Sooji Hong, Seungwan Ryoo, Taehee Chang, Keon Hoon Lee, Byoung-Kuk Na, Sung-Jong Hong, Virak Khieu, Jong-Yil Chai
    The Korean Journal of Parasitology.2021; 59(5): 531.     CrossRef
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    Laddawan Patarwut, Thapana Chontananarth, Jong-Yil Chai, Watchariya Purivirojkul
    The Korean Journal of Parasitology.2020; 58(1): 27.     CrossRef
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    Jong-Yil Chai, Bong-Kwang Jung, Keon Hoon Lee, Jin-Youp Ryu, Hyeon-Seung Kim, Sung-Jong Hong, Thi Thi Htoon, Htay Htay Tin, Byoung-Kuk Na, Woon-Mok Sohn
    The Korean Journal of Parasitology.2020; 58(6): 701.     CrossRef
  • Morphological and Molecular Identification of Stellantchasmus dermogenysi n. sp. (Digenea: Heterophyidae) in Thailand
    Chalobol Wongsawad, Nattawadee Nantarat, Pheravut Wongsawad, Preeyaporn Butboonchoo, Jong-Yil Chai
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Original Articles

Prevalence and Associated Risk Factors of Toxocara vitulorum Infections in Buffalo and Cattle Calves in Three Provinces of Central Cambodia
Pierre Dorny, Brecht Devleesschauwer, Val?rie Stoliaroff, Meas Sothy, Rortana Chea, Bunthon Chea, Hor Sourloing, Sum Samuth, Seth Kong, Koemseang Nguong, San Sorn, Davun Holl, Jozef Vercruysse
Korean J Parasitol 2015;53(2):197-200.
Published online April 22, 2015
DOI: https://doi.org/10.3347/kjp.2015.53.2.197
The prevalence and associated risk factors of Toxocara vitulorum infection in buffalo and cattle calves was studied in 3 provinces in central Cambodia. Fecal samples were collected from 517 calves between the age of 1-15 weeks and processed for nematode egg counts by a modified McMaster method. A total of 64 calves were found to excrete T. vitulorum eggs in their feces (12.4%; 95% exact CI: 9.7-15.5). The mean fecal egg count was 2,798 EPG (SD=16,351; range=0-224,400). A multivariable generalized linear mixed model showed higher odds of T. vitulorum infection for buffalo versus cattle, for animals aged 4-8 weeks versus younger and older ones, and for animals with strongyle infection. There was no association with fecal consistency. Farmers should be aware of the potential impact of T. vitulorum, and treat their calves at the age of 2-3 weeks with anthelmintics such as benzimidazoles or pyrantel.

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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

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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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

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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Brief Communications
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

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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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

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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Status of intestinal parasite infections among children in Bat Dambang, Cambodia
Seung Kyu Park, Dong-Heui Kim, Young-Kun Deung, Hun-Joo Kim, Eun-Ju Yang, Soo-Jung Lim, Yong-Suk Ryang, Dan Jin, Kyu-Jae Lee
Korean J Parasitol 2004;42(4):201-203.
Published online December 20, 2004
DOI: https://doi.org/10.3347/kjp.2004.42.4.201

A survey was conducted to determine the extent of intestinal parasite infection in Bat Dambang, Cambodia in March 2004. A total of 623 fecal specimens was collected from kindergarten and schoolchildren and examined using the formalin-ether sedimentation technique. The overall infection rate of intestinal parasites was 25.7% (boys, 26.2%; girls, 25.1%), and the infection rates of intestinal helminthes by species were as follows: Echinostoma sp. 4.8%, hookworm 3.4%, Hymenolepis nana 1.3%, and Rhabditis sp. 1.3%. The infection rates of intestinal protozoa were; Entamoeba coli 4.8%, Giardia lamblia 2.9%, Iodamoeba butschlii 1.4%, Entamoeba polecki 1.1%, and Entamoeba histolytica 0.8%. There were no egg positive cases of Ascaris lumbricoides or Trichuris trichiura. All children infected were treated with albendazole, praziquantel, or metronidazole according to parasite species. The results showed that intestinal parasites are highly endemic in Bat Dambang, Cambodia.

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Status of intestinal parasites infection among primary school children in Kampongcham, Cambodia
Kyu-Jae Lee, Yong-Tae Bae, Dong-Heui Kim, Young-Kun Deung, Yong-Suk Ryang, Hun-Joo Kim, Kyung-Il Im, Tai-Soon Yong
Korean J Parasitol 2002;40(3):153-155.
Published online September 30, 2002
DOI: https://doi.org/10.3347/kjp.2002.40.3.153

A survey was made to find the extent of intestinal parasite infection in Kampongcham, Cambodia in February 2002. A total of 251 fecal specimens were collected from Tonlebat primary school children and examined by formalin-ether sedimentation technique. The overall infection rate of intestinal parasite was 54.2% (males, 57.3%; females, 50.8%). The infection rate of intestinal helminths by the species were as follows: Ascaris lumbricoides 26.3%, Echinostoma sp. 15.6%, hookworm 6.4%, Opisthorchis sp. 4.0%, Rhabditis sp. 2.4%, and Trichuris trichiura 0.4%. The infection rate of intestinal protozoa were as follows: E. coli 7.6%, G. lamblia 3.2%, I. butschlii 3.2%, and E. histolytica 0.8%. More than two different kinds of parasites were found in 16.7% of the stool samples. All the children infected were treated with albendazole, praziquantel and metronidazole according to parasite species. The results showed that intestinal parasites are highly endemic in this area.

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