Parasites, Hosts and Diseases

"Bounnaloth Insisiengmay"

Brief Communications

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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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

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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.

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Development and utilization of a visual loop-mediated isothermal amplification coupled with a lateral flow dipstick (LAMP-LFD) assay for rapid detection of Echinostomatidae metacercaria in edible snail samples
Wasin Panich, Phonkawin Jaruboonyakorn, Awika Raksaman, Thanawan Tejangkura, Thapana Chontananarth
International Journal of Food Microbiology.2024; 418: 110732. CrossRef
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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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

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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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Ana Allende, Avelino Alvarez‐Ordóñez, Valeria Bortolaia, Sara Bover‐Cid, Alessandra De Cesare, Wietske Dohmen, Laurent Guillier, Lieve Herman, Liesbeth Jacxsens, Maarten Nauta, Lapo Mughini‐Gras, Jakob Ottoson, Luisa Peixe, Fernando Perez‐Rodriguez, Panag
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Lakhanawan Charoensuk, Alexis Ribas, Kacha Chedtabud, Suksanti Prakobwong
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Ei Ei Phyo Myint, Amornpun Sereemaspun, Joacim Rocklöv, Choosak Nithikathkul
International Journal of Environmental Research and Public Health.2020; 17(11): 4108. CrossRef
Larval Gnathostomes and Zoonotic Trematode Metacercariae in Fish from a Local Market in Yangon City, Myanmar
Jong-Yil Chai, Bong-Kwang Jung, Keon Hoon Lee, Jin-Youp Ryu, Hyeon-Seung Kim, Sung-Jong Hong, Thi Thi Htoon, Htay Htay Tin, Byoung-Kuk Na, Woon-Mok Sohn
The Korean Journal of Parasitology.2020; 58(6): 701. CrossRef
Infection status with zoonotic trematode metacercariae in fish from Lao PDR
Jong-Yil Chai, Soon-Hyung Lee, Han-Jong Rim, Woon-Mok Sohn, Bounlay Phommasack
Acta Tropica.2019; 199: 105100. CrossRef
Ultrasonographic investigation of cholangiocarcinoma in Lao PDR
Ju Yeong Kim, Tai-Soon Yong, Han-Jong Rim, Jong-Yil Chai, Duk-Young Min, Keeseon S. Eom, Woon-Mok Sohn, Jae Hoon Lim, Dongil Choi, Sithat Insisiengmay, Bounlay Phommasack, Bounnaloth Insisiengmay
Acta Tropica.2018; 182: 128. CrossRef
Opisthorchis viverrini infection in the snail and fish intermediate hosts in Central Vietnam
Ha Thanh Thi Dao, Veronique Dermauw, Sarah Gabriël, Apiporn Suwannatrai, Smarn Tesana, Giang Thanh Thi Nguyen, Pierre Dorny
Acta Tropica.2017; 170: 120. CrossRef
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Jian-Hua Qiu, Ying Zhang, Xiao-Xuan Zhang, Yuan Gao, Qi Li, Qiao-Cheng Chang, Chun-Ren Wang
Foodborne Pathogens and Disease.2017; 14(8): 440. CrossRef
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Jong-Yil Chai, Bong-Kwang Jung
Food and Waterborne Parasitology.2017; 8-9: 33. CrossRef
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Atcharaphan Wanlop, Chalobol Wongsawad, Pongphol Prattapong, Pheravut Wongsawad, Thapana Chontananarth, Jong-Yil Chai
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Zoonotic Trematode Metacercariae in Fish from Yangon, Myanmar and Their Adults Recovered from Experimental Animals
Jong-Yil Chai, Woon-Mok Sohn, Byoung-Kuk Na, Jong-Bok Park, Hoo-Gn Jeoung, Eui-Hyug Hoang, Thi Thi Htoon, Htay Htay Tin
The Korean Journal of Parasitology.2017; 55(6): 631. CrossRef

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

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

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Foodborne intestinal flukes: A brief review of epidemiology and geographical distribution
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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
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Infection status with zoonotic trematode metacercariae in fish from Lao PDR
Jong-Yil Chai, Soon-Hyung Lee, Han-Jong Rim, Woon-Mok Sohn, Bounlay Phommasack
Acta Tropica.2019; 199: 105100. 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
Ultrasonographic investigation of cholangiocarcinoma in Lao PDR
Ju Yeong Kim, Tai-Soon Yong, Han-Jong Rim, Jong-Yil Chai, Duk-Young Min, Keeseon S. Eom, Woon-Mok Sohn, Jae Hoon Lim, Dongil Choi, Sithat Insisiengmay, Bounlay Phommasack, Bounnaloth Insisiengmay
Acta Tropica.2018; 182: 128. CrossRef
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
The Korean Journal of Parasitology.2018; 56(1): 75. CrossRef
Fishborne zoonotic heterophyid infections: An update
Jong-Yil Chai, Bong-Kwang Jung
Food and Waterborne Parasitology.2017; 8-9: 33. CrossRef

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

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Brief Communication

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

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

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Original Article

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

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

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Brief Communications

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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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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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
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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 Articles

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
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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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High prevalence of liver and intestinal fluke infections among residents of Savannakhet Province in Laos: Jong-Yil Chai, Eun-Taek Han, Sang-Mee Guk, Eun-Hee Shin, Woon-Mok Sohn, Tai-Soon Yong, Keeseon S. Eom, Keon-Hoon Lee, Hoo-Gn Jeong, Yong-Sang Ryang, Eui-Hyug Hoang, Bounlay Phommasack, Bounnaloth Insisiengmay, Soon-Hyung Lee, Han-Jong Rim; Korean J Parasitol 2007;45(3):213-218.
Published online September 20, 2007; DOI: https://doi.org/10.3347/kjp.2007.45.3.213

Abstract
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The prevalence of liver and intestinal fluke infections was surveyed on residents of Savannakhet Province, Laos. Fecal specimens were collected from a total of 981 residents in 4 Mekong riverside villages and examined by the Kato-Katz thick smear technique. The results revealed that the overall helminth egg positive rate was 84.2%, and the positive rate for small trematode eggs, including Opisthorchis viverrini, heterophyids, or lecithodendriids, was 67.1%. To obtain adult flukes, 38 small trematode egg positive cases were treated with a 20-30 mg/kg single dose of praziquantel and purged. Diarrheic stools were then collected from 29 people and searched for helminth parasites using stereomicroscopes. Mixed infections with O. viverrini and 6 kinds of intestinal flukes were found, namely, Haplorchis taichui, Haplorchis pumilio, Haplorchis yokogawai, Prosthodendrium molenkampi, Phaneropsolus bonnei, and echinostomes. The total number of flukes collected was 7,693 specimens (av. no. per treated person; 265.3). The most common species was O. viverrini, followed by H. taichui, P. molenkampi, echinostomes, H. pumilio, P. bonnei, and H. yokogawai. The results indicate that foodborne liver and intestinal fluke infections are prevalent among residents of Savannakhet Province, Laos.

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