Parasites, Hosts and Diseases

"Duk-Young Min"

Original Article

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

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

Citations

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Effects of paediatric schistosomiasis control programmes in sub-Saharan Africa: A systematic review
Maryline Vere, Wilma ten Ham-Baloyi, Paula Ezinne Melariri, Raquel Inocencio da Luz
PLOS ONE.2024; 19(5): e0301464. CrossRef
Soil-transmitted helminth (STH) infections in the Wolaita zone in Southern Ethiopia: mid-stage evaluation of the Geshiyaro project and progress towards the interruption of transmission
Birhan Mengistu, Ewnetu Firdawek Liyew, Melkie Chernet, Geremew Tasew, Rosie Maddren, Benjamin Collyer, Ufaysa Anjulo, Adugna Tamiru, Kathryn Forbes, Zelalem Mehari, Kebede Deribe, Teshale Yadeta, Mihretab Salasibew, Getachew Tollera, Roy Anderson
Parasites & Vectors.2024;[Epub] CrossRef
Parasitic helminth infections in humans modulate Trefoil Factor levels in a manner dependent on the species of parasite and age of the host
Babatunde Adewale, Jonathan R. Heintz, Christopher F. Pastore, Heather L. Rossi, Li-Yin Hung, Nurudeen Rahman, Jeff Bethony, David Diemert, James Ayorinde Babatunde, De’Broski R. Herbert, Subash Babu
PLOS Neglected Tropical Diseases.2021; 15(10): e0009550. CrossRef

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Brief Communication

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

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

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

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Original Article

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

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

Citations

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Development of a duplex loop-mediated isothermal amplification together with lateral flow dipstick assay for the detection and discrimination of parasitic infections in chickens between cestodes belonging to genus Raillietina and trematodes in family Echi
Wasin Panich, Thanawan Tejangkura, Thapana Chontananarth
Research in Veterinary Science.2025; 185: 105539. CrossRef
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
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
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
Unravelling another mystery: Parasite escape and host‐switching vary spatially in non‐indigenous populations of Japanese mystery snails
Amy E. Fowler, Grace A. Loonam, April M. H. Blakeslee
Freshwater Biology.2022; 67(8): 1316. CrossRef
Snail-borne zoonotic trematodes in edible viviparid snails obtained from wet markets in Northern Thailand
K. Chantima, C. Rika
Journal of Helminthology.2020;[Epub] CrossRef

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Brief Communications

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

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

Citations

Citations to this article as recorded by

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

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

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

Citations

Citations to this article as recorded by

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
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
Foodborne intestinal flukes: A brief review of epidemiology and geographical distribution
Jong-Yil Chai, Bong-Kwang Jung
Acta Tropica.2020; 201: 105210. CrossRef
Echinostoma aegyptica (Trematoda: Echinostomatidae) Infection in Five Riparian People in Savannakhet Province, Lao PDR
Jong-Yil Chai, Bong-Kwang Jung, Taehee Chang, Hyejoo Shin, Woon-Mok Sohn, Keeseon S. Eom, Tai-Soon Yong, Duk-Young Min, Bounlay Phammasack, Bounnaloth Insisiengmay, Han-Jong Rim
The Korean Journal of Parasitology.2020; 58(1): 67. CrossRef
Echinostoma mekongi n. sp. (Digenea: Echinostomatidae) from Riparian People along the Mekong River in Cambodia
Jaeeun Cho, Bong-Kwang Jung, Taehee Chang, Woon-Mok Sohn, Muth Sinuon, Jong-Yil Chai
The Korean Journal of Parasitology.2020; 58(4): 431. CrossRef
Echinochasmus caninus n. comb. (Trematoda: Echinostomatidae) Infection in Eleven Riparian People in Khammouane Province, Lao PDR
Jong-Yil Chai, Taehee Chang, Bong-Kwang Jung, Hyejoo Shin, Woon-Mok Sohn, Keeseon S. Eom, Tai-Soon Yong, Duk-Young Min, Bounlay Phammasack, Bounnaloth Insisiengmay, Han-Jong Rim
The Korean Journal of Parasitology.2019; 57(4): 451. CrossRef

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Interaction between Trichomonas vaginalis and the Prostate Epithelium: Jung-Hyun Kim, Ik-Hwan Han, Sang-Su Kim, Soon-Jung Park, Duk-Young Min, Myoung-Hee Ahn, Jae-Sook Ryu; Korean J Parasitol 2017;55(2):213-218.
Published online April 30, 2017; DOI: https://doi.org/10.3347/kjp.2017.55.2.213

Abstract
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Most men infected with Trichomonas vaginalis are asymptomatic and can remain undiagnosed and untreated. This has been hypothesized to result in chronic persistent prostatic infection. Adhesion of the protozoan organisms to mucosal cells is considered a first and prerequisite step for T. vaginalis infection. Adhesion of T. vaginalis to prostate epithelial cells has not yet been observed; however, there are several reports about inflammation of prostate epithelial cells induced by T. vaginalis. The aim of this study was to investigate whether adhesion and cytotoxicity of T. vaginalis are involved in inflammation of prostate epithelial cells. When RWPE-1 cells were infected with T. vaginalis (1:0.4 or 1:4), adhesion of T. vaginalis continuously increased for 24 hr or 3 hr, respectively. The cytotoxicity of prostate epithelial cells infected with T. vaginalis (RWPE-1: T. vaginalis=1:0.4) increased at 9 hr; at an infection ratio of 1:4, cytotoxicity increased after 3 hr. When the RWPE-1 to T. vaginalis ratio was 1:0.4 or 1:4, production of IL-1β, IL-6, CCL2, and CXCL8 also increased. Epithelial-mesenchymal transition (EMT) was verified by measuring decreased E-cadherin and increased vimentin expression at 24 hr and 48 hr. Taken together, the results indicate that T. vaginalis adhered to prostate epithelial cells, causing cytotoxicity, pro-inflammatory cytokine production, and EMT. Our findings suggest for the first time that T. vaginalis may induce inflammation via adhesion to normal prostate epithelial cells.

Citations

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The Role of Colposcopy in Women with Normal Cytology and High-risk Human Papilloma Virus Positivity, Except for Types 16 and 18
Necim Yalçın, Aysun Alcı, Mustafa Gökkaya, Mehmet Göksu, Tayfun Toptaş, Işın Üreyen
Bagcilar Medical Bulletin.2025;[Epub] CrossRef
Point-of-Care Diagnostic for Trichomonas vaginalis, the Most Prevalent, Non-Viral Sexually Transmitted Infection
John F. Alderete, Hermes Chan
Pathogens.2023; 12(1): 77. CrossRef
Inflammatory response to Trichomonas vaginalis in the pathogenesis of prostatitis and benign prostatic hyperplasia
Ik-Hwan Han, Jung-Hyun Kim, Jae-Sook Ryu
Parasites, Hosts and Diseases.2023; 61(1): 2. CrossRef
Inflammatory responses during trichomoniasis: The role of Toll‐like receptors and inflammasomes
Abdollah Jafarzadeh, Maryam Nemati, Ehsan Salarkia, Sonal Yadav, Najmeh Aminizadeh, Sara Jafarzadeh, Manisha Yadav
Parasite Immunology.2023;[Epub] CrossRef
Epidemiology, Natural History, Diagnosis, and Treatment of Trichomonas vaginalis in Men
Olivia T Van Gerwen, Andres F Camino, Jyoti Sharma, Patricia J Kissinger, Christina A Muzny
Clinical Infectious Diseases.2021; 73(6): 1119. CrossRef
Extracorporeal Shockwave Therapy (ESWT) Alleviates Pain, Enhances Erectile Function and Improves Quality of Life in Patients with Chronic Prostatitis/Chronic Pelvic Pain Syndrome
Wen-Ling Wu, Oluwaseun Adebayo Bamodu, Yuan-Hung Wang, Su-Wei Hu, Kai-Yi Tzou, Chi-Tai Yeh, Chia-Chang Wu
Journal of Clinical Medicine.2021; 10(16): 3602. CrossRef
Prevalence and risk factors for Trichomonas vaginalis infection among adults in the U.S., 2013–2014
Erin L. Tompkins, Thomas A. Beltran, Elizabeth J. Gelner, Aaron R. Farmer, Ethan Morgan
PLOS ONE.2020; 15(6): e0234704. CrossRef
Advancing Prevention of STIs by Developing Specific Serodiagnostic Targets: Trichomonas vginalis as a Model
John F. Alderete
International Journal of Environmental Research and Public Health.2020; 17(16): 5783. CrossRef
Inflammation as a Driver of Prostate Cancer Metastasis and Therapeutic Resistance
Maddison Archer, Navneet Dogra, Natasha Kyprianou
Cancers.2020; 12(10): 2984. CrossRef
Prevalence ofTrichomonas vaginalisInfection Among US Males, 2013–2016
Michael Daugherty, Kendall Glynn, Timothy Byler
Clinical Infectious Diseases.2019; 68(3): 460. CrossRef
Inflammatory mediators of prostate epithelial cells stimulated with Trichomonas vaginalis promote proliferative and invasive properties of prostate cancer cells
Ik‐Hwan Han, Jung‐Hyun Kim, Ki‐Seok Jang, Jae‐Sook Ryu
The Prostate.2019; 79(10): 1133. CrossRef
Synopsis: Special Issue on “Disruption of signaling homeostasis induced crosstalk in the carcinogenesis paradigmEpistemology of the origin of cancer”
Björn L.D.M. Brücher, Ijaz S. Jamall, Obul R. Bandapalli
4open.2019; 2: 28. CrossRef
Proliferation of prostate epithelia induced by IL‐6 from stroma reacted with Trichomonas vaginalis
J.‐H. Kim, I.‐H. Han, Y.‐S. Kim, C.‐S. Noh, J.‐S. Ryu
Parasite Immunology.2018;[Epub] CrossRef

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

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

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

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Hailu Merga, Teshome Degefa, Zewdie Birhanu, Ephrem Abiy, Ming-Chieh Lee, Guiyun Yan, Delenasaw Yewhalaw
Malaria Journal.2025;[Epub] CrossRef
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Zachary R Popkin-Hall, Misago D Seth, Rashid A Madebe, Rule Budodo, Catherine Bakari, Filbert Francis, Dativa Pereus, David J Giesbrecht, Celine I Mandara, Daniel Mbwambo, Sijenunu Aaron, Abdallah Lusasi, Samwel Lazaro, Jeffrey A Bailey, Jonathan J Julian
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Rachel Sendor, Cedar L. Mitchell, Frank Chacky, Ally Mohamed, Lwidiko E. Mhamilawa, Fabrizio Molteni, Ssanyu Nyinondi, Bilali Kabula, Humphrey Mkali, Erik J. Reaves, Naomi Serbantez, Chonge Kitojo, Twilumba Makene, Thwai Kyaw, Meredith Muller, Alexis Mwan
Emerging Infectious Diseases.2023;[Epub] CrossRef
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Alphaxard Manjurano, Justin J. Omolo, Eric Lyimo, Donald Miyaye, Coleman Kishamawe, Lucas E. Matemba, Julius J. Massaga, John Changalucha, Paul E. Kazyoba
Malaria Journal.2021;[Epub] CrossRef
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Philip Koliopoulos, Neema Mathias Kayange, Tim Daniel, Florian Huth, Britta Gröndahl, Grey Carolina Medina-Montaño, Leah Pretsch, Julia Klüber, Christian Schmidt, Antke Züchner, Sebastian Ulbert, Steven E. Mshana, Marylyn Addo, Stephan Gehring
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Paul M. Hayuma, Christian W. Wang, Edwin Liheluka, Vito Baraka, Rashid A. Madebe, Daniel T. R. Minja, Gerald Misinzo, Michael Alifrangis, John P. A. Lusingu
Malaria Journal.2021;[Epub] CrossRef
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Anthony Kapesa, Namanya Basinda, Elias C. Nyanza, Joshua Monge, Sospatro E Ngallaba, Joseph R Mwanga, Eliningaya J Kweka
Research and Reports in Tropical Medicine.2020; Volume 11: 53. CrossRef
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Talal S. Alwajeeh, Rashad Abdul-Ghani, Amal F. Allam, Hoda F. Farag, Safia S. M. Khalil, Amel Y. Shehab, Mona H. El-Sayad, Raed A. Alharbi, Shaia S. R. Almalki, Ahmed A. Azazy
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Improved Perceptions and Practices Related to Schistosomiasis and Intestinal Worm Infections Following PHAST Intervention on Kome Island, North-Western Tanzania: Joseph R. Mwanga, Godfrey M. Kaatano, Julius E. Siza, Su Young Chang, Yunsuk Ko, Cyril M. Kullaya, Jackson Nsabo, Keeseon S. Eom, Tai-Soon Yong, Jong-Yil Chai, Duk-Young Min, Han-Jong Rim, John M. Changalucha; Korean J Parasitol 2015;53(5):561-569.
Published online October 29, 2015; DOI: https://doi.org/10.3347/kjp.2015.53.5.561

Abstract
PDF

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

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Integrated Schistosomiasis and Soil-Transmitted Helminthiasis Control over Five Years on Kome Island, Tanzania
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The Korean Journal of Parasitology.2015; 53(5): 535. CrossRef

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

Abstract
PDF

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

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

Abstract
PDF

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

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Prevalence of human Schistosoma mansoni infection in endemic regions (2010–2024): a systematic review and meta-analysis
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Hannah J Russell, James M StJ Penney, Cortland Linder, Elizabeth C Joekes, Amaya L Bustinduy, J Russell Stothard, Daniel A L Rakotomampianina, Emmanuel H Andriamasy, Lalarizo R Mahary, Elodie P Ranjanoro, Alain M Rahetilahy, Stephen A Spencer
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Andreas Mueller, Antje Fuss, Uwe Ziegler, Godfrey M. Kaatano, Humphrey D. Mazigo
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Humphrey D. Mazigo, John H. Amuasi, Isaac Osei, Safari M. Kinung’hi
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Association Between Polymorphisms of the Mannose-Binding Lectin and Severity of Periportal Fibrosis in Schistosomiasis, in the Northeast of Brazil
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Humphrey D. Mazigo, Fred Nuwaha, David W. Dunne, Godfrey M. Kaatano, Tekla Angelo, Stella Kepha, Safari M. Kinung’hi
The Korean Journal of Parasitology.2017; 55(5): 533. CrossRef
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Acta Radiologica Open.2016;[Epub] CrossRef

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

Abstract
PDF

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

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

Abstract
PDF

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

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Original Articles

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

Abstract
PDF

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

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

Abstract
PDF

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

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

Abstract
PDF

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

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

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

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Brief Communication

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

Abstract
PDF

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

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Original Article

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

Abstract
PDF

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

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Brief Communication

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

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

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Original Articles

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

Abstract
PDF

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

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The Korean Journal of Parasitology.2020; 58(1): 67. CrossRef
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The Korean Journal of Parasitology.2019; 57(6): 657. CrossRef
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Fishborne Trematode Metacercariae in Luang Prabang, Khammouane, and Saravane Province, Lao PDR: Han-Jong Rim, Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Jong-Yil Chai, Duk-Young Min, Soon-Hyung Lee, Eui-Hyug Hoang, Bounlay Phommasack, Sithat Insisiengmay; Korean J Parasitol 2013;51(1):107-114.
Published online February 18, 2013; DOI: https://doi.org/10.3347/kjp.2013.51.1.107

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

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Brief Communications

Human Infections with Liver and Minute Intestinal Flukes in Guangxi, China: Analysis by DNA Sequencing, Ultrasonography, and Immunoaffinity Chromatography: Hyeong-Kyu Jeon, Dongmin Lee, Hansol Park, Duk-Young Min, Han-Jong Rim, Hongman Zhang, Yichao Yang, Xueming Li, Keeseon S Eom; Korean J Parasitol 2012;50(4):391-394.
Published online November 26, 2012; DOI: https://doi.org/10.3347/kjp.2012.50.4.391

Abstract
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The prevalence of liver and intestinal fluke infections was determined by surveying inhabitants of Hengxuan, Fusui, and Shanglin villages which were known to be endemic for liver flukes in Guangxi, China in May 2010. A total of 718 people were examined for helminth eggs by the Kato-Katz thick smear technique, ultrasonography, immunoaffinity chromatography, and DNA sequencing. The overall egg positive rate was found to be 59.6% (28.0-70.6%) that included mixed infections with liver and intestinal flukes. Cases showing higher than 20,000 eggs per gram of feces (EPG) were detected between 1.3% and 16.2%. Ultrasonographic findings exhibited overall 28.2% (72 of 255 cases) dilatation rate of the intrahepatic bile duct. Clonorchis sinensis infection was detected serologically in 88.3% (38 of 43 cases) among C. sinensis egg positive subjects by the immunoaffinity chromatography using a specific antigen for C. sinensis. For differential diagnosis of the liver and intestinal flukes, more precise PCR and nucleotide sequencing for copro-DNA were performed for 46 egg positive cases. Mixed infections with C. sinensis and Metagonimus yokogawai were detected in 8 of 46 egg positive cases, whereas 29 specimens were positive for Haplorchis taichui. Ultrasonographic findings and immunoaffinity chromatography results showed usefulness, even in a limited way, in figuring out of the liver fluke endemicity.

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

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

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Original Article

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

Abstract
PDF

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

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Brief Communication

Prevalence of the Intestinal Flukes Haplorchis taichui and H. yokogawai in a Mountainous Area of Phongsaly Province, Lao PDR: Jong-Yil Chai, Tai-Soon Yong, Keeseon S. Eom, Duk-Young Min, Eun-Hee Shin, Virasack Banouvong, Bounnaloth Insisiengmay, Sithat Insisiengmay, Bounlay Phommasack, Han-Jong Rim; Korean J Parasitol 2010;48(4):339-342.
Published online December 16, 2010; DOI: https://doi.org/10.3347/kjp.2010.48.4.339

Abstract
PDF

Phongsaly Province, located in the northernmost area of Lao PDR, was previously suggested to be endemic for the liver fluke Opisthorchis viverrini infection. To confirm, or rule out, this suggestion, the Phonxay village in the Khoua District, Phongsaly Province, was selected for a survey. Ten volunteers (8 men and 2 women aged 31-57 years) who consumed raw freshwater fish and had gastrointestinal troubles were treated with a single dose of praziquantel (40 mg/kg) and pyrantel pamoate (10 mg/kg) and purged with magnesium sulfate to recover any worm parasites. Eight of the 10 volunteers expelled 1 or more species of trematodes, nematodes, or cestodes (worm positive rate; 80%). The worms were morphologically identified as H. taichui (861 worms from 8 people), H. yokogawai (59 from 6 people), Phaneropsolus bonnei (1 from 1 person), Trichostrongylus sp. (2 from 2 people), Ascaris lumbricoides (2 from 1 person), Enterobius vermicularis (11 from 3 people), and Taenia saginata (1 strobila with scolex from 1 person). The results indicate that the mountainous area of Phongsaly Province, Lao PDR, is not endemic for the liver fluke but endemic for intestinal flukes, in particular, Haplorchis taichui and H. yokogawai.

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Original Article

Morphologic and Genetic Identification of Diphyllobothrium nihonkaiense in Korea: Hyeong-Kyu Jeon, Kyu-Heon Kim, Sun Huh, Jong-Yil Chai, Duk-Young Min, Han-Jong Rim, Keeseon S. Eom; Korean J Parasitol 2009;47(4):369-375.
Published online December 1, 2009; DOI: https://doi.org/10.3347/kjp.2009.47.4.369

Abstract
PDF

Diphyllobothrium nihonkaiense was first described by Yamane in 1986 but the taxonomical features have been obscure due to lack of critical morphologic criteria in its larval and adult stages. In Korea, this tapeworm had long been known as Diphyllobothrium latum. In this study, we observed 62 specimens collected from Korean residents and analyzed them by morphological features and nucleotide sequences of mitochondrial cox1 gene as well as the ITS1 region. Adult tapeworms were examined after carmine or trichrome stain. Longitudinal sections of the gravid proglottids showed an obtuse angle of about 150 degree between the cirrus sac and seminal vesicle. This angle is known as a major differential point compared with that of D. latum. Nucleotide sequence differences between D. latum and the specimens from Koreans represented 17.3% in mitochondrial DNA cox1 gene. Sequence divergence of ITS1 among 4 Korean isolates was 0.3% and similarity was 99.7% with D. nihonkaiense and D. klebanovskii. All of the Korean specimens analyzed in this study were identified as being D. nihonkaiense (n = 62). We propose its Korean name as "Dong-hae-gin-chon-chung" which means 'long tapeworm of the East Sea' for this newly analyzed diphyllobothriid tapeworm in Korea.

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Mini Review

Eosinophil-Mediated Tissue Inflammatory Responses in Helminth Infection: Myeong Heon Shin, Young Ah Lee, Duk-Young Min; Korean J Parasitol 2009;47(Suppl):S125.
Published online October 26, 2009; DOI: https://doi.org/10.3347/kjp.2009.47.S.S125

Abstract
PDF

Eosinophilic leukocytes function in host protection against parasitic worms. In turn, helminthic parasites harbor specific molecules to evade or paralyze eosinophil-associated host immune responses; these molecules facilitate the migration and survival of parasitic helminths in vivo. This competition between eosinophil and worm leads to stable equilibria between them. An understanding of such dynamic host-eosinophil interactions will help us to uncover mechanisms of cross talk between host and parasite in helminth infection. In this review, we examine recent findings regarding the innate immune responses of eosinophils to helminthic parasites, and discuss the implications of these findings in terms of eosinophil-mediated tissue inflammation in helminth infection.

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Original Articles

Fishborne Trematode Metacercariae in Freshwater Fish from Guangxi Zhuang Autonomous Region, China: Woon-Mok Sohn, Keeseon S. Eom, Duk-Young Min, Han-Jong Rim, Eui-Hyug Hoang, Yichao Yang, Xueming Li; Korean J Parasitol 2009;47(3):249-257.
Published online August 28, 2009; DOI: https://doi.org/10.3347/kjp.2009.47.3.249

Abstract
PDF

A survey was performed to investigate the infection status of fishborne trematode (FBT) metacercariae in freshwater fish from Guangxi Zhuang Autonomous Region, China. A total of 307 freshwater fish of 31 species were collected from 5 administrative regions of Guangxi Zhuang Autonomous Region. They were examined by artificial digestion method from July 2003 to August 2004. No metacercariae were detected in fish from Fusui-xian. In fish from Mashan-xian and a market in Nanning, 3 species of metacercariae, Haplorchis taichui, Haplorchis pumilio, and Centrocestus formosanus, were mainly detected. Metacercariae (8 in number) of Clonorchis sinensis were found in 1 Chanodichthys dabryi purchased from a market in Nanning. In fish from Yangshuo, Metagonimus yokogawai metacercariae were detected from all 18 fish species examined. Total 13 C. sinensis metacercariae were found in 3 out of 10 Hemibarbus maculatus from Yangshuo. All 7 Zacco platypus from Yangshuo were infected with 8-112 Echinochasmus perfoliatus metacercariae. In fish from Binyang-xian, H. pumilo metacercariae were mainly detected in all 5 fish species examined, and only 1 metacercaria of C. sinensis was found in a Hemiculter leucisculus. From the above results, it was confirmed that some species of freshwater fish play a role of second intermediate hosts for FBT in Guangxi Zhuang Autonomous Region, China. In particular, 4 species of intestinal flukes, M. yokogawai, H. taichui, H. pumilio, and C. formosanus, were prevalent in fish hosts, whereas C. sinensis metacercariae were detected only in 3 fish species.

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High Prevalence of Haplorchis taichui, Phaneropsolus molenkampi, and Other Helminth Infections among People in Khammouane Province, Lao PDR: Jong-Yil Chai, Eun-Taek Han, Eun-Hee Shin, Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Duk-Young Min, Jin-Young Um, Min-Sung Park, Eui-Hyug Hoang, Bounlay Phommasack, Bounnaloth Insisiengmay, Soon-Hyung Lee, Han-Jong Rim; Korean J Parasitol 2009;47(3):243-247.
Published online August 28, 2009; DOI: https://doi.org/10.3347/kjp.2009.47.3.243

Abstract
PDF

The prevalence of liver and intestinal helminth infections, including Opisthorchis, Haplorchis, Phaneropsolus, hookworms, Enterobius, and Taenia, was surveyed in Khammouane province, Lao PDR. Fecal specimens were collected from 1,242 people (590 men and 652 women) in 3 Mekong riverside villages and were examined by the Kato-Katz thick smear technique. The overall helminth egg positive rate was 81.1%. The positive rate for small trematode eggs, including Opisthorchis viverrini, heterophyids, and lecithodendriids, was 81.1% and the positive rate for hookworms was 6.7%. To obtain adult worms, 35 people who were positive for small trematode eggs were treated with 20-30 mg/kg praziquantel and 10-15 mg/kg pyrantel pamoate, and then purged. Diarrheic stools were collected from 33 of these people and searched for helminth parasites using a stereomicroscope. Mixed infections with various helminths (Haplorchis taichui, Haplorchis yokogawai, Prosthodendrium molenkampi, Phaneropsolus bonnei, echinostomes, hookworms, Trichostrongylus spp., Trichuris trichiura, Enterobius vermicularis, and/or Taenia saginata) were found. The total number of helminth specimens collected was 20,907 (approximately 634 per person). The most common species was H. taichui, followed by P. molenkampi, O. viverrini, P. bonnei, E. vermicularis, hookworms, and Trichostrongylus spp. These results show that diverse species of intestinal nematodes, trematodes, and cestodes are infecting humans in Khammouane province, Lao PDR.

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Indochinamon ou (Crustacea: Potamidae) as a New Second Intermediate Host for Paragonimus harinasutai in Luang Prabang Province, Lao PDR: Woon-Mok Sohn, Jae-Sook Ryu, Duk-Young Min, Hyun-Ouk Song, Han-Jong Rim, Youthanavanh Vonghachack, Daluny Bouakhasith, Virasack Banouvong; Korean J Parasitol 2009;47(1):25-29.
Published online March 12, 2009; DOI: https://doi.org/10.3347/kjp.2009.47.1.25

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Paragonimus harinasutai metacercariae were found in a species of freshwater crab, Indochinamon ou, collected in a small stream of Namback District, Luang Prabang Province, Lao PDR. Adult flukes were recovered after experimental infection of the metacercariae to dogs. Metacercariae were round or slightly elliptical, 0.666 × 0.626 mm in average size, and had a thin cyst wall of about 20 ?m in thickness, a black excretory bladder, convoluted ceca, and some pinkish materials in the body. Adults were somewhat elongated, 95.2 × 36.5 mm in average size, covered with single-tipped tegumental spines, had a smaller oral sucker than the ventral sucker, a moderately branched ovary, and 5-6 lobulated testes. Eggs were ovoid and bilaterally symmetrical in shape, 79 × 45 ?m in average size, and had a uniformly thickened shell. By the present study, it has been confirmed that I. ou is a new second intermediate host for P. harinasutai.

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Fishborne Trematode Metacercariae Detected in Freshwater Fish from Vientiane Municipality and Savannakhet Province, Lao PDR: Han-Jong Rim, Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Jong-Yil Chai, Duk-Young Min, Soon-Hyung Lee, Eui-Hyug Hoang, Bounlay Phommasack, Sithat Insisengmay; Korean J Parasitol 2008;46(4):253-260.
Published online December 20, 2008; DOI: https://doi.org/10.3347/kjp.2008.46.4.253

Abstract
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Freshwater fish from Vientiane Municipality and Savannakhet Province, Lao PDR were examined by the muscle compression and artificial digestion methods to know the infection status with trematode metacercariae. In the fish from Savannakhet, 2 species of metacercariae, Opisthorchis viverrini and Haplorchis taichui, were detected. O. viverrini metacercariae were found in 6 species of fish, Puntius brevis, Hampala dispar, Esomus metallicus, Mystacoleucus marginatus, Puntioplites falcifer, and Cyclocheilichthys armatus. H. taichui metacercariae were detected in 3 species of fish, P. brevis, P. falcifer, and M. marginatus. In the fish from Vientiane, 4 species of metacercariae, O. viverrini, H. taichui, Haplorchis yokogawai, and Centrocestus formosanus, were detected. Among them, O. viverrini metacercariae were found in 7 species of fish, Onychostoma elongatum, C. armatus, H. dispar, P. brevis, Cyclocheilichthys repasson, Osteochilus hasseltii, and Hypsibarbus lagleri. The metacercariae of H. taichui were detected in 6 species of fish, C. repasson, O. elongatum, C. armatus, H. dispar, Labiobarbus leptocheila, and Cirrhinus molitorella. The metacercariae of H. yokogawai were found in 9 species of fish, C. repasson, O. elongatum, C. armatus, H. dispar, Labiobarbus leptocheila, O. hasseltii. C. molitorella, Hypsibarbus wetmorei, and H. lagleri. The metacercariae of C. formosanus were detected in 4 species of fish, C. repasson, P. brevis, O. hasseltii, and C. molitorella. From these results, it is confirmed that fishborne trematode metacercariae, i.e. O. viverrini, H. taichui, H. yokogawai and C. formosanus, are prevalent in various species of freshwater fish from Savannakhet Province and Vientiane Municipality, Lao PDR.

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Brief Communications

Skin Test for Paragonimiasis among Schoolchildren and Villagers in Namback District, Luangprabang Province, Lao PDR: Hyun-Ouk Song, Duk-Young Min, Han-Jong Rim, Vonghachack Youthanavanh, Bouakhasith Daluny, Vongsouvan Sengdara, Banouvong Virasack, Phommasak Bounlay; Korean J Parasitol 2008;46(3):179-182.
Published online September 20, 2008; DOI: https://doi.org/10.3347/kjp.2008.46.3.179

Abstract
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As a part of a broader effort to determine the status of Paragonimus species infection in Lao PDR, an epidemiological survey was conducted on villagers and schoolchildren in Namback District between 2003 and 2005. Among 308 villagers and 633 primary and secondary schoolchildren, 156 villagers and 92 children evidenced a positive reaction on a Paragonimus skin test. Only 4 schoolchildren out of 128 skin test-positive cases had Paragonimus sp. eggs in their sputum, all of which was collected on 1 day. Several types of crabs, which were identified as the second intermediate host of the Paragonimus species, were collected from markets and streams in a paragonimiasis endemic area for the inspection of metacercariae. Among the examined crabs, only "rock crabs" (Indochinamon ou) harbored Paragonimus sp. metacercariae, and it is speculated that the life cycle of Paragonimus sp. was maintained via rock crabs in Namback District, Lao PDR.

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Differential diagnosis of Trichostrongylus and hookworm eggs via PCR using ITS-1 sequence: Tai-Soon Yong, Jong-Ho Lee, Seobo Sim, Jongweon Lee, Duk-Young Min, Jong-Yil Chai, Keeseon S. Eom, Woon-Mok Sohn, Soon-Hyung Lee, Han-Jong Rim; Korean J Parasitol 2007;45(1):69-74.
Published online March 20, 2007; DOI: https://doi.org/10.3347/kjp.2007.45.1.69

Abstract
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Trichostrongylus eggs observed in cellophane-thick smears are difficult, in practice, to distinguish from hookworm eggs. In order to overcome these limitations, a molecular approach was conducted. A Trichostrongylus colubriformis adult worm was obtained from a human in Laos, which was identified morphologically. ITS-1 sequence of this worm was determined, and found to be most similar with that of T. colubriformis among the Trichostrongylus spp. reported so far. Then, this sequence was compared with those of human hookworm species, Ancylostoma duodenale and Necator americanus, and species-specific oligonucleotide primers were designed. Polymerase chain reaction (PCR) using these primers evidenced specifically amplified PCR products of Trichostrongylus sp., A. duodenale and N. americanus from the eggs of each (520 bp, 690 bp, and 870 bp, respectively). A species-specific PCR technique can be developed in order to study the epidemiology of Trichostrongylus spp. and hookworms in endemic areas.

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Original Article

Involvement of MAPK activation in chemokine or COX-2 productions by Toxoplasma gondii: Ji-Young Kim, Myoung-Hee Ahn, Hyun-Ouk Song, Jong-Hak Choi, Jae-Sook Ryu, Duk-Young Min, Myung-Hwan Cho; Korean J Parasitol 2006;44(3):197-207.
Published online September 20, 2006; DOI: https://doi.org/10.3347/kjp.2006.44.3.197

Abstract
PDF

This experiment focused on MAPK activation in host cell invasion and replication of T. gondii, as well as the expression of CC chemokines, MCP-1 and MIP-1α, and enzyme, COX-2/prostaglandin E₂ (PGE₂) in infected cells via western blot, [³H]-uracil incorporation assay, ELISA and RT-PCR. The phosphorylation of ERK1/2 and p38 in infected HeLa cells was detected at 1 hr and/or 6 hr postinfection (PI). Tachyzoite proliferation was reduced by p38 or JNK MAPK inhibitors. MCP-1 secretion was enhanced in infected peritoneal macrophages at 6 hr PI. MIP-1α mRNA was increased in macrophages at 18 hr PI. MCP-1 and MIP-1α were reduced after treatment with inhibitors of ERK1/2 and JNK MAPKs. COX-2 mRNA gradually increased in infected RAW 264.7 cells and the secretion of COX-2 peaked at 6 hr PI. The inhibitor of JNK suppressed COX-2 expression. PGE₂ from infected RAW 264.7 cells was increased and synthesis was suppressed by PD98059, SB203580, and SP600125. In this study, the activation of p38, JNK and/or ERK1/2 MAPKs occurred during the invasion and proliferation of T. gondii tachyzoites in HeLa cells. Also, increased secretion and expression of MCP-1, MIP-1α, COX-2 and PGE₂ were detected in infected macrophages, and appeared to occur via MAPK signaling pathways.

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Mini Review

Trichomonas vaginalis and trichomoniasis in the Republic of Korea: Jae-Sook Ryu, Duk-Young Min; Korean J Parasitol 2006;44(2):101-116.
Published online June 20, 2006; DOI: https://doi.org/10.3347/kjp.2006.44.2.101

Abstract
PDF

Vaginal trichomoniasis, caused by Trichomonas vaginalis, is the most common sexually transmitted disease. More than 170 million people worldwide are annually infected by this protozoan. In the Republic of Korea, 10.4% of women complaining of vaginal symptoms and signs were found to be infected with T. vaginalis. However, despite its high prevalence, the pathogenesis of T. vaginalis infection has not been clearly characterized although neutrophil infiltration is considered to be primarily responsible for the cytologic changes associated with this infection. We hypothesized that trichomonads in the vagina sometime after an acute infection secrete proteins like excretory-secretory product that have a chemotactic effect on neutrophils, and that these neutrophils are further stimulated by T. vaginalis to produce chemokines like IL-8 and GRO-α, which further promote neutrophil recruitment and chemotaxis. Thus, neutrophil accumulation is believed to maintain or aggravate inflammation. However, enhanced neutrophil apoptosis induced by live T. vaginalis could contribute to resolution of inflammation. Macrophages may constitute an important component of host defense against T. vaginalis infection. For example, mouse macrophages alone and those activated by lymphokines or nitric oxide are known to be involved in the extracellular killing of T. vaginalis. In the host, T. vaginalis uses a capping phenomenon to cleave host immunoglobulins with proteinases and thus escape from host immune responses. Recently, we developed a highly sensitive and specific diagnostic polymerase chain reaction (PCR) technique using primers based on a repetitive sequence cloned from T. vaginalis (TV-E650), and found that the method enables the detection of T. vaginalis at concentrations as low as 1 cell per PCR mixture.

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Original Article

Influence of calcium ion on host cell invasion and intracellular replication by Toxoplasma gondii: Hyun-Ouk Song, Myoung-Hee Ahn, Jae-Sook Ryu, Duk-Young Min, Kyoung-Hwan Joo, Young-Ha Lee; Korean J Parasitol 2004;42(4):185-193.
Published online December 20, 2004; DOI: https://doi.org/10.3347/kjp.2004.42.4.185

Abstract
PDF

Toxoplasma gondii is an obligate intracellular protozoan parasite, which invades a wide range of hosts including humans. The exact mechanisms involved in its invasion are not fully understood. This study focused on the roles of Ca²⁺ in host cell invasion and in T. gondii replication. We examined the invasion and replication of T. gondii pretreated with several calcium modulators, the conoid extrusion of tachyzoites. Calmodulin localization in T. gondii were observed using the immunogold method, and Ca²⁺ levels in tachyzoites by confocal microscopy. In light microscopic observation, tachyzoites co-treated with A23187 and EGTA showed that host cell invasion and intracellular replication were decreased. The invasion of tachyzoites was slightly inhibited by the Ca²⁺ channel blockers, bepridiland verapamil, and by the calmodulin antagonist, calmidazolium. We observed that calcium saline containing A23187 induced the extrusion of tachyzoite conoid. By immunoelectron microscopy, gold particles bound to anti-calmodulin or anti-actin mAb, were found to be localized on the anterior portion of tachyzoites. Remarkably reduced intracellular Ca²⁺ was observed in tachyzoites treated with BAPTA/AM by confocal microscopy. These results suggest that host cell invasion and the intracellular replication of T. gondii tachyzoites are inhibited by the calcium ionophore, A23187, and by the extracellular calcium chelator, EGTA.

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Case Report

A human case of house dust mite Tarsonemus floricolus collected from sputum: Jae-Sook Ryu, Han-Il Ree, Duk-Young Min, Myoung-Hee Ahn; Korean J Parasitol 2003;41(3):171-173.
Published online September 20, 2003; DOI: https://doi.org/10.3347/kjp.2003.41.3.171

Abstract
PDF

A 23-year-old medical student showed a positive reaction on a skin test for Paragonimus westermani, and two Tarsonemus floricolus mites were subsequently found by sputum examination and identified morphologically. Our report is the first human case of Tarsonemus floricolus in Korea.

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Prevalence and risk factors associated with intestinal acaroid mite and helminthic infection among school-aged children in Northern Egypt
Sarah M. Abdo, Mohamed Mostafa Tahoun, E. S. El-Wakil, Yusuf A. Edmardash, Hend A. El-Taweel, Heba Elhadad, Hend Hamdy, Ramy Mohamed Ghazy
Journal of Parasitic Diseases.2025;[Epub] CrossRef
When mites attack: domestic mites are not just allergens
Yubao Cui
Parasites & Vectors.2014;[Epub] CrossRef
Dust mites in a routine clinical stool sample
Bushra Zia, Hassaan Bin Aftab, Mohammad Faizan Zahid, Joveria Farooqi, Feroze Uddin, Mohammad Asim Beg
Asian Pacific Journal of Tropical Biomedicine.2014; 4: S563. CrossRef
Experimental method for isolating and identifying dust mites from sputum in pulmonary acariasis
Rafael Martínez-Girón, Hugo Cornelis van Woerden, Andrés Ribas-Barceló
Experimental and Applied Acarology.2007; 42(1): 55. CrossRef
Clinical Significance of Mites in Urine
Leigh A. Dini, John A. Frean
Journal of Clinical Microbiology.2005; 43(12): 6200. CrossRef

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Original Article

Control of clonorchiasis by repeated treatments with praziquantel: Sung-Tae Hong, Han-Jong Rim, Duk-Young Min, Xueming Li, Jingxian Xu, Zheng Feng, Soon-Hyung Lee; Korean J Parasitol 2001;39(4):285-292.
Published online December 31, 2001; DOI: https://doi.org/10.3347/kjp.2001.39.4.285

Abstract
PDF

The present study aimed to evaluate control efficacy of clonorchiasis by two schemes of repeated treatment with praziquantel at two endemic villages In China. Residents of one village at Guangxi Autonomous Region were treated and examined 6-monthly and of another at Liaoning Province 12-monthly. In residents that took 25 mg/kg x3 (total 75 mg/kg) of praziquantel every 6 months for one year the egg positive rate showed a significant drop from 69.0% to 17.1%. In contrast, a group of same praziquantel medication once showed a slight marginal decrease in the egg rate from 18.9% to 12.2% after one year. Of 39 subjects examined 3 times, 56.4% were cured, 7.7% persistently positive, one (2.6%) reinfected after cure or newly infected, but 25.6% were persistently negative. The present finding suggests that 6-monthly medication with 75 mg/kg of praziquantel should effectively lower the prevalence but incomplete for control of clonorchiasis in heavy endemic areas.

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Clonorchiasis and opisthorchiasis: epidemiology, transmission, clinical features, morbidity, diagnosis, treatment, and control
Men-Bao Qian, Jennifer Keiser, Jürg Utzinger, Xiao-Nong Zhou, Graeme N. Forrest
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Pornphutthachat Sota, Morsid Andityas, Manas Kotepui, Banchob Sripa
Infectious Diseases of Poverty.2024;[Epub] 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
Cost yield of different treatment strategies against Clonorchis sinensis infection
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A co-infection case report of Taenia saginata in a patient with subclinical clonorchiasis confirmed by the combination of diagnostic tools
Ju Hyeon Shin, Eun Jeong Won, Jee Seung Jung, Kyung-Hwa Park, Kwang Il Nam, Soo Hyun Kim, Jong Hee Shin
BMC Infectious Diseases.2019;[Epub] CrossRef
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Xiaoya Zhan, Hui-Yuan Yeh, Dong Hoon Shin, Jong-Yil Chai, Min Seo, Piers D. Mitchell
The Korean Journal of Parasitology.2019; 57(6): 601. CrossRef
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Wei Wu, Xiaohua Qian, Yixin Huang, Qingbiao Hong
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S.M. Mazidur Rahman, Min-Ho Choi, Young Mee Bae, Sung-Tae Hong
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S. M. Mazidur Rahman, Young Mee Bae, Sung-Tae Hong, Min-Ho Choi
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Hyun-Kyung Kim, Hyeng-Il Cheun, Byung-Suk Cheun, Ki-Yeon Lee, Tong-Soo Kim, Sang-Eun Lee, Won-ja Lee, Shin-Hyeong Cho
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Min-Ho Choi, Sue K. Park, Zhimin Li, Zhuo Ji, Gui Yu, Zheng Feng, Longqi Xu, Seung-Yull Cho, Han-Jong Rim, Soon-Hyung Lee, Sung-Tae Hong, Banchob Sripa
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Shin-Hyeong Cho, Ki-Yeon Lee, Byung-Chul Lee, Pyo-Yun Cho, Hyeong-Il Cheun, Sung-Tae Hong, Woon-Mok Sohn, Tong-Soo Kim
The Korean Journal of Parasitology.2008; 46(3): 133. CrossRef
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Eun-Min Kim, Jae-Lip Kim, Sung Yil Choi, Jae-Whan Kim, Siwon Kim, Min-Ho Choi, Young Mee Bae, Soon-Hyung Lee, Sung-Tae Hong
The Korean Journal of Parasitology.2008; 46(4): 247. CrossRef
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Hongman Zhang, Byung-Suk Chung, Shunyu Li, Min-Ho Choi, Sung-Tae Hong
Parasitology Research.2008; 102(6): 1111. CrossRef
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Min-Ho Choi, Byung-Chan Chang, Seung-Jin Lee, In-Jin Jang, Sang-Goo Shin, Weon-Gyu Kho, Jin-Ho Chun, Sung-Tae Hong
The Korean Journal of Parasitology.2006; 44(4): 361. CrossRef
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Sung-Tae Hong, Jong-Yil Chai, Min-Ho Choi, Sun Huh, Han-Jong Rim, Soon-Hyung Lee
The Korean Journal of Parasitology.2006; 44(3): 177. CrossRef
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Case Report

Two imported cases of cutaneous larva migrans: Jin-Woo Park, Sang-Jin Kwon, Jae-Sook Ryu, Eun-Kyung Hong, Jung-Uk Lee, Hee-Joon Yu, Myoung-Hee Ahn, Duk-Young Min; Korean J Parasitol 2001;39(1):77-81.
Published online March 31, 2001; DOI: https://doi.org/10.3347/kjp.2001.39.1.77

Abstract
PDF

Cutaneous larva migrans (CLM) is a rare serpiginous cutaneous eruption caused by accidental penetration and migration in the skin with infective larvae of nematode that normally do not have the human as their host. Although CLM has a worldwide distribution, the infection is most frequent in warmer climates. More recently, they have been increasingly imported from the tropics or subtropics by travelers. We experienced two patients who had pruritic serpiginous linear eruption in their skin for a few weeks after traveling to the endemic areas (Brazil and Thailand, respectively). After the treatment with albendazole, the skin lesions resolved with post-inflammatory hyperpigmentation. We report herein two cases of cutaneous larva migrans successfully treated with albendazole.

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Original Article

Toxoplasma gondii: Ultrastructural localization of specific antigens and inhibition of intracellular multiplication by monoclonal antibodies: Boo-Young Lee, Myoung-Hee Ahn, Hyun-Chul Kim, Duk-Young Min; Korean J Parasitol 2001;39(1):67-75.
Published online March 31, 2001; DOI: https://doi.org/10.3347/kjp.2001.39.1.67

Abstract
PDF

This experiment was focused on the characterization of anti-Toxoplasma monoclonal antibodies (mAbs) and the effect of mAbs on the parasite invasion of mouse peritoneal macrophages. Twenty eight mAbs including M110, M556, R7A6 and M621 were characterized by Ab titer, immunoglobulin isotyping and western blot pattern. Antibody titer (optical density) of 4 mAbs, M110, M556, R7A6 and M621, were 0.53, 0.67, 0.45 and 0.39 (normal mouse serum; 0.19) with the same IgG1 isotypes shown by Enzyme-linked immunosorbent assay (ELISA). Western blot analysis showed that M110, M556, R7A6 and M621 reacted with the 33 kDa (p30), 31 kDa (p28), 43 kDa and 36 kDa protein. Immunogold labelling of mAbs M110, M556, R7A6 and M621 reacted with the surface membrane, dense granules and parasitophorous vacuolar membrane (PVM), rhoptries and cytoplasm of tachyzoite, respectively. For in vitro assay, preincubation of tachyzoites with four mAbs, M110, M556, R7A6 and M621 resulted in the decrease of the number of infected macrophages (p < 0.05) and the suppression of parasite multiplication at 18 h postinfection. Four monoclonal antibodies including M110 (SAG1) were found to have an important role in the inhibition of macrophage invasion and T. gondii multiplication in vitro, and these mAbs may be suitable for vaccine candidates, diagnostic kit and for chemotherapy.

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The Korean Journal of Parasitology.2001; 39(3): 233. CrossRef

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Brief Communication

Infection status of Paragonimus westermani metacercariae in crayfish (Cambaroides similis) collected from Bogildo (Islet), Wando-gun, Chollanam-do, Korea: Myeong-Heon Shin, Duk-Young Min; Korean J Parasitol 1999;37(1):55-57.
Published online March 31, 1999; DOI: https://doi.org/10.3347/kjp.1999.37.1.55

Abstract
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During the period from October 1996 to November 1998, the infection status of Paragonimus westermani metacercariae in freshwater crayfish (Cambaroides similis) collected from Bogildo (islet), Wando-gun, Chollanam-do, which is known for an endemic area of P. westermani in Korea, were examined. The average infection rate of Paragonimus metacercariae in crayfish was 88.6%, and mean number of metacercariae per infected crayfish was 30.2. This metacercarial density was the highest in the group of weight in 7.1-9.0 g. These results suggest that the natural life cycle of P. westermani is still well-preserved in Bogildo.

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Recent Incidence of Paragonimus westermani Metacercariae in Freshwater Crayfish, Cambaroides similis, from Two Enzootic Sites in Jeollanam-do, Korea
Jin-Ho Song, Fuhong Dai, Xuelian Bai, Tae-Im Kim, Hyun-Jong Yang, Tong-Soo Kim, Shin-Hyung Cho, Sung-Jong Hong
The Korean Journal of Parasitology.2017; 55(3): 347. CrossRef
Northeast India Helminth Parasite Information Database (NEIHPID): Knowledge Base for Helminth Parasites
Devendra Kumar Biswal, Manish Debnath, Graciously Kharumnuid, Welfrank Thongnibah, Veena Tandon, Govindhaswamy Umapathy
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Matt Longshaw
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Infection Status of Freshwater Crabs and Crayfish with Metacercariae of Paragonimus westermani in Korea
Eun-Min Kim, Jae-Lip Kim, Sung-Il Choi, Soon-Hyung Lee, Sung-Tae Hong
The Korean Journal of Parasitology.2009; 47(4): 425. CrossRef
North American Paragonimiasis (Caused byParagonimus kellicotti) in the Context of Global Paragonimiasis
Gary W. Procop
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A 27 kDa Cysteine Protease Secreted by Newly Excysted Paragonimus westermani Metacercariae Induces Superoxide Anion Production and Degranulation of Human Eosinophils
Young-Bae Chung, Hirohito Kita, Myeong Heon Shin
The Korean Journal of Parasitology.2008; 46(2): 95. CrossRef
Cysteine Protease Secreted byParagonimus westermaniAttenuates Effector Functions of Human Eosinophils Stimulated with Immunoglobulin G
W. A. Petri, Myeong Heon Shin, Hirohito Kita, Hae Young Park, Ju Young Seoh
Infection and Immunity.2001; 69(3): 1599. CrossRef

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Original Articles

Karyotypes on three species of Chinese mesogastropod snails, Semisulcospira libertina, S. dolichostoma and Viviparus rivularis: Gab-Man Park, Jae-Jin Kim, Pyung-Rim Chung, Yong Wang, Duk-Young Min; Korean J Parasitol 1999;37(1):5-11.
Published online March 31, 1999; DOI: https://doi.org/10.3347/kjp.1999.37.1.5

Abstract
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Three species of the families Viviparidae and Pleuroceridae, the first intermediate host of paragonimiasis, metagonimiasis and echinostomiasis were studied cytologically. The observed diploid chromosome number was as follows: Semisulcospira libertina 36, S. dolichostoma 34, and Viviparus rivularis 64. The mitotic chromosome complement of S. libertina has nine metacentric pairs and nine submetacentric pairs, and S. dolichostoma has three metacentric pairs and 14 submetacentric pairs of chromosomes. Viviparus rivularis showed two metacentric pairs and 30 submetacentric pairs of chromosomes.

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BMC Biology.2018;[Epub] CrossRef
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Jae-Suk Choi, Joo-Wan Kim, Jeong Been Park, Sang Eun Pyo, Yong-Ki Hong, Sae Kwang Ku, Mi-Ryung Kim
International Journal of Molecular Medicine.2017; 39(6): 1437. CrossRef
Karyotype of Arion vulgaris Moquin-Tandon, 1856 (Gastropoda: Pulmonata: Arionidae)
Alexandr V. Garbar, Natalia S. Kadlubovska
Folia Malacologica.2014;[Epub] CrossRef

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Degradations of human immunoglobulins and hemoglobin by a 60 kDa cysteine proteinase of Trichomonas vaginalis: Duk-Young Min, Keun-Hee Hyun, Jae-Sook Ryu, Myoung-Hee Ahn, Myung-Hwan Cho; Korean J Parasitol 1998;36(4):261-268.
Published online December 20, 1998; DOI: https://doi.org/10.3347/kjp.1998.36.4.261

Abstract
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The present study was undertaken to investigate the role of cysteine proteinase of Trichomonas vaginalis in escaping from host defense mechanism. A cysteine proteinase of T. vaginalis was purified by affinity chromatography and gel filtration. Optimum pH for the purified proteinase activity was 6.0. The proteinase was inhibited by cysteine and serine proteinase inhibitors such as E-64, NEM, IAA, leupeptin, TPCK and TLCK, and also by Hg²⁺, but not affected by serine-, metallo-, and aspartic proteinase inhibitors such as PMSF, EDTA and pepstatin A. However, it was activated by the cysteine proteinase activator, DTT. The molecular weight of a purified proteinase was 62 kDa on gel filtration and 60 kDa on SDS-PAGE. Interestingly, the purified proteinase was able to degrade serum IgA, secretory IgA, and serum IgG in time- and dose-dependent manners. In addition, the enzyme also degraded hemoglobin in a dose-dependent manner. These results suggest that the acidic cysteine proteinase of T. vaginalis may play a dual role for parasite survival in conferring escape from host humoral defense by degradation of immunoglobulins, and in supplying nutrients to parasites by degradation of hemoglobin.

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Hemoglobin uptake and utilization by human protozoan parasites: a review
Magda Reyes-López, Beatriz Aguirre-Armenta, Carolina Piña-Vázquez, Mireya de la Garza, Jesús Serrano-Luna
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Camila Braz Menezes, Tiana Tasca
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Gerardo Ramírez‐Rico, Moisés Martínez‐Castillo, Mireya de la Garza, Mineko Shibayama, Jesús Serrano‐Luna
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Biological roles of cysteine proteinases in the pathogenesis ofTrichomonas vaginalis
Hilda M. Hernández, Ricardo Marcet, Jorge Sarracent
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Jae-Sook Ryu
The Korean Journal of Urogenital Tract Infection and Inflammation.2014; 9(2): 61. CrossRef
Trichomoniasis
Jae-Sook Ryu
Hanyang Medical Reviews.2010; 30(3): 213. CrossRef
Identification and characterization of a surface-associated, subtilisin-like serine protease inTrichomonas vaginalis
PABLO HERNÁNDEZ-ROMANO, ROBERTO HERNÁNDEZ, ROSSANA ARROYO, JOHN F. ALDERETE, IMELDA LÓPEZ-VILLASEÑOR
Parasitology.2010; 137(11): 1621. CrossRef
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Shahed Ardalan, B. Craig Lee, Gary E. Garber
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Induction of human host cell apoptosis by Trichomonas vaginalis cysteine proteases is modulated by parasite exposure to iron
Shelley Kummer, Gary R. Hayes, Robert O. Gilbert, David H. Beach, John J. Lucas, Bibhuti N. Singh
Microbial Pathogenesis.2008; 44(3): 197. CrossRef
Giardia duodenalis: protein substrates degradation by trophozoite proteases
Silvana Torossian Coradi, Semíramis Guimarães
Parasitology Research.2006; 99(2): 131. CrossRef
Trichomonas vaginalis and trichomoniasis in the Republic of Korea
Jae-Sook Ryu, Duk-Young Min
The Korean Journal of Parasitology.2006; 44(2): 101. CrossRef
Identification of Trichomonas vaginalis Cysteine Proteases That Induce Apoptosis in Human Vaginal Epithelial Cells
Ulf Sommer, Catherine E. Costello, Gary R. Hayes, David H. Beach, Robert O. Gilbert, John J. Lucas, Bibhuti N. Singh
Journal of Biological Chemistry.2005; 280(25): 23853. CrossRef
Trichomonas vaginalis: characterization of a 39-kDa cysteine proteinase found in patient vaginal secretions
Rodolfo Hernández-Gutiérrez, Leticia Avila-González, Jaime Ortega-López, Fernando Cruz-Talonia, Guillermo Gómez-Gutierrez, Rossana Arroyo
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Biological and biochemical modulation of Trichomonas vaginalis KT9 isolate after shifting of culture medium from TPS-1 into TYM: Jae-Sook Ryu, Ryung Choi, So-Young Park, Hyun Park, Duk-Young Min; Korean J Parasitol 1998;36(4):255-260.
Published online December 20, 1998; DOI: https://doi.org/10.3347/kjp.1998.36.4.255

Abstract
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To evaluate the biological and biochemical characteristics of Trichomonas vaginalis KT9 isolate, the growth and size of trichomonads, pathogenicity in mouse, protein profiles and proteinase activity were examined after shifting the medium from TPS-1 into TYM. Generation time of trichomonads in TYM medium was 4.5 hr in comparison to TPS-1 with 7.1 hr. Size of trichomonads cultured in TPS-1 medium (8.5 ± 0.9 × 6.0 ± 0.9 ?m) was significantly smaller than those in TYM medium (10.9 ± 1.4 × 8.2 ± 0.9 ?m). Trichomonads cultured in TYM medium produced subcutaneous abscess in 9 out of 10 mice, whereas those in TPS-1 medium produced abscesses in 2 out of 10 mice. In SDS-PAGE, trichomonad lysates from both media showed ten common bands. However, trichomonads in TYM medium showed additional bands of 136 kDa, 116 kDa and 40 kDa in comparison to those in TPS-1 with 100 kDa. By immunoblot with T. vaginalis-immunized rabbit sera, T. vaginalis cultivated in both TYM and TPS-1 media showed 5 common bands, and unique bands of 116 kDa, 105 kDa, and 86 kDa were observed in trichomonads in TYM while a 140 kDa band in those in TPS-1. In gelatin SDS-PAGE, trichomonads in TYM degraded gelatin stronger than those in TPS-1. Also protease activity of trichomonads in TYM was significantly higher than that of trichomonads in TPS-1 using Bz-Pro-Phe-Arg-Nan as a substrate. According to the results, it is assumed that the shift from TPS-1 into TYM medium for cultivation of T. vaginalis might modulate the biological and biochemical properties of T. vaginalis in vitro.

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Ji-Hae Kim, Jae-Sook Ryu, Mi-Young Lee
Toxicology and Environmental Health Sciences.2014; 6(1): 48. CrossRef
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Brief Communication

Genetic variance of Trichomonas vaginalis isolates by Southern hybridization: Jae-Sook Ryu, Duk-Young Min, Myeong-Heon Shin, Youl-Hee Cho; Korean J Parasitol 1998;36(3):207-211.
Published online September 20, 1998; DOI: https://doi.org/10.3347/kjp.1998.36.3.207

Abstract
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In the present study, genomic DNAs were purified from Korean isolates (KT8, KT6, KT-Kim and KT-Lee) and foreign strains (CDC85, IR78 and NYH 286) of Trichomonas vaginalis, and hybridized with a probe based on the repetitive sequence cloned from T. vaginalis to observe the genetic differences. By Southern hybridization, all isolates of T. vaginalis except the NYH286 strain had 11 bands. Therefore all isolates examined were distinguishable into 3 groups according to their banding patterns; i) KT8, KT6 and KT-Kim isolates had 11 identical bands such as 1 kb, 1.2 kb, 1.6 kb, 1.9 kb, 2.3 kb, 2.7 kb, 3.2 kb, 3.4 kb, 3.8 kb, 4.9 kb and 6.0 kb. ii) The metronidazole-resistant IR78 strain had the same bands as KT-Lee isolate at bands of 1 kb, 1.2 kb, 1.6 kb, 1.8 kb, 2.1 kb, 2.5 kb, 2.7 kb, 2.9 kb, 3.4 kb, 5.0 kb and 6.0 kb. Bands of CDC85, metronidazole-resistant strain, were similar to those of IR78 and KT-Lee, except that 3.2 kb replaced 2.9 kb. iii) NYH286 particularly had 12 bands and band patterns were similar to IR78 with a few exceptions as follows: i) 6.2 kb in place of 6.0 kb, ii) 2.0 kb and 2.2 kb instead of 2.1 kb. Through the results obtained, genetic variance of T. vaginalis isolates was demonstrated by Southern hybridization.

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