Mixed infections with Opisthorchis viverrini and intestinal flukes in residents of Vientiane Municipality and Saravane Province in Laos

J. Y. Chai, L. H. Park, E. T. Han, S. M. Guk, E. H. Shin, A. Lin, J. L. Kim, W. M. Sohn, T. S. Yong, K. S. Eom, D. Y. Min, E. H. Hwang, B. Phommmasack, B. Insisiengmay, H. J. Rim

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Abstract

Faecal examinations for helminth eggs were performed on 1869 people from two riverside localities, Vientiane Municipality and Saravane Province, along the Mekong River, Laos. To obtain adult flukes, 42 people positive for small trematode eggs (Opisthorchis viverrini, heterophyid, or lecithodendriid eggs) were treated with a 20-30 mg kg-1 single dose of praziquantel and purged. Diarrhoeic stools were then collected from 36 people (18 in each area) and searched for helminth parasites using stereomicroscopes. Faecal examinations revealed positive rates for small trematode eggs of 53.3% and 70.8% (average 65.2%) in Vientiane and Saravane Province, respectively. Infections with O. viverrini and six species of intestinal flukes were found, namely, Haplorchis taichui, H. pumilio, H. yokogawai, Centrocestus caninus, Prosthodendrium molenkampi, and Phaneropsolus bonnei. The total number of flukes collected and the proportion of fluke species recovered were markedly different in the two localities; in Vientiane, 1041 O. viverrini (57.8 per person) and 615 others (34.2 per person), whereas in Saravane, 395 O. viverrini (21.9 per person) and 155207 others (8622.6 per person). Five people from Saravane harboured no O. viverrini but numerous heterophyid and/or lecithodendriid flukes. The results indicate that O. viverrini and several species of heterophyid and lecithodendriid flukes are endemic in these two riverside localities, and suggest that the intensity of infection and the relative proportion of fluke species vary by locality along the Mekong River basin.

Original languageEnglish
Pages (from-to)283-289
Number of pages7
JournalJournal of Helminthology
Volume79
Issue number3 SPEC. ISS.
DOIs
Publication statusPublished - 2005 Sep 1

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Opisthorchis viverrini
Opisthorchis
Laos
Trematoda
flukes
Coinfection
mixed infection
Eggs
Mekong River
Helminths
Rivers
helminths
Haplorchis
Praziquantel
praziquantel
Infection
infection
Parasites

All Science Journal Classification (ASJC) codes

  • Parasitology
  • Animal Science and Zoology

Cite this

Chai, J. Y. ; Park, L. H. ; Han, E. T. ; Guk, S. M. ; Shin, E. H. ; Lin, A. ; Kim, J. L. ; Sohn, W. M. ; Yong, T. S. ; Eom, K. S. ; Min, D. Y. ; Hwang, E. H. ; Phommmasack, B. ; Insisiengmay, B. ; Rim, H. J. / Mixed infections with Opisthorchis viverrini and intestinal flukes in residents of Vientiane Municipality and Saravane Province in Laos. In: Journal of Helminthology. 2005 ; Vol. 79, No. 3 SPEC. ISS. pp. 283-289.
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title = "Mixed infections with Opisthorchis viverrini and intestinal flukes in residents of Vientiane Municipality and Saravane Province in Laos",
abstract = "Faecal examinations for helminth eggs were performed on 1869 people from two riverside localities, Vientiane Municipality and Saravane Province, along the Mekong River, Laos. To obtain adult flukes, 42 people positive for small trematode eggs (Opisthorchis viverrini, heterophyid, or lecithodendriid eggs) were treated with a 20-30 mg kg-1 single dose of praziquantel and purged. Diarrhoeic stools were then collected from 36 people (18 in each area) and searched for helminth parasites using stereomicroscopes. Faecal examinations revealed positive rates for small trematode eggs of 53.3{\%} and 70.8{\%} (average 65.2{\%}) in Vientiane and Saravane Province, respectively. Infections with O. viverrini and six species of intestinal flukes were found, namely, Haplorchis taichui, H. pumilio, H. yokogawai, Centrocestus caninus, Prosthodendrium molenkampi, and Phaneropsolus bonnei. The total number of flukes collected and the proportion of fluke species recovered were markedly different in the two localities; in Vientiane, 1041 O. viverrini (57.8 per person) and 615 others (34.2 per person), whereas in Saravane, 395 O. viverrini (21.9 per person) and 155207 others (8622.6 per person). Five people from Saravane harboured no O. viverrini but numerous heterophyid and/or lecithodendriid flukes. The results indicate that O. viverrini and several species of heterophyid and lecithodendriid flukes are endemic in these two riverside localities, and suggest that the intensity of infection and the relative proportion of fluke species vary by locality along the Mekong River basin.",
author = "Chai, {J. Y.} and Park, {L. H.} and Han, {E. T.} and Guk, {S. M.} and Shin, {E. H.} and A. Lin and Kim, {J. L.} and Sohn, {W. M.} and Yong, {T. S.} and Eom, {K. S.} and Min, {D. Y.} and Hwang, {E. H.} and B. Phommmasack and B. Insisiengmay and Rim, {H. J.}",
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Chai, JY, Park, LH, Han, ET, Guk, SM, Shin, EH, Lin, A, Kim, JL, Sohn, WM, Yong, TS, Eom, KS, Min, DY, Hwang, EH, Phommmasack, B, Insisiengmay, B & Rim, HJ 2005, 'Mixed infections with Opisthorchis viverrini and intestinal flukes in residents of Vientiane Municipality and Saravane Province in Laos', Journal of Helminthology, vol. 79, no. 3 SPEC. ISS., pp. 283-289. https://doi.org/10.1079/JOH2005302

Mixed infections with Opisthorchis viverrini and intestinal flukes in residents of Vientiane Municipality and Saravane Province in Laos. / Chai, J. Y.; Park, L. H.; Han, E. T.; Guk, S. M.; Shin, E. H.; Lin, A.; Kim, J. L.; Sohn, W. M.; Yong, T. S.; Eom, K. S.; Min, D. Y.; Hwang, E. H.; Phommmasack, B.; Insisiengmay, B.; Rim, H. J.

In: Journal of Helminthology, Vol. 79, No. 3 SPEC. ISS., 01.09.2005, p. 283-289.

Research output: Contribution to journalArticle

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T1 - Mixed infections with Opisthorchis viverrini and intestinal flukes in residents of Vientiane Municipality and Saravane Province in Laos

AU - Chai, J. Y.

AU - Park, L. H.

AU - Han, E. T.

AU - Guk, S. M.

AU - Shin, E. H.

AU - Lin, A.

AU - Kim, J. L.

AU - Sohn, W. M.

AU - Yong, T. S.

AU - Eom, K. S.

AU - Min, D. Y.

AU - Hwang, E. H.

AU - Phommmasack, B.

AU - Insisiengmay, B.

AU - Rim, H. J.

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N2 - Faecal examinations for helminth eggs were performed on 1869 people from two riverside localities, Vientiane Municipality and Saravane Province, along the Mekong River, Laos. To obtain adult flukes, 42 people positive for small trematode eggs (Opisthorchis viverrini, heterophyid, or lecithodendriid eggs) were treated with a 20-30 mg kg-1 single dose of praziquantel and purged. Diarrhoeic stools were then collected from 36 people (18 in each area) and searched for helminth parasites using stereomicroscopes. Faecal examinations revealed positive rates for small trematode eggs of 53.3% and 70.8% (average 65.2%) in Vientiane and Saravane Province, respectively. Infections with O. viverrini and six species of intestinal flukes were found, namely, Haplorchis taichui, H. pumilio, H. yokogawai, Centrocestus caninus, Prosthodendrium molenkampi, and Phaneropsolus bonnei. The total number of flukes collected and the proportion of fluke species recovered were markedly different in the two localities; in Vientiane, 1041 O. viverrini (57.8 per person) and 615 others (34.2 per person), whereas in Saravane, 395 O. viverrini (21.9 per person) and 155207 others (8622.6 per person). Five people from Saravane harboured no O. viverrini but numerous heterophyid and/or lecithodendriid flukes. The results indicate that O. viverrini and several species of heterophyid and lecithodendriid flukes are endemic in these two riverside localities, and suggest that the intensity of infection and the relative proportion of fluke species vary by locality along the Mekong River basin.

AB - Faecal examinations for helminth eggs were performed on 1869 people from two riverside localities, Vientiane Municipality and Saravane Province, along the Mekong River, Laos. To obtain adult flukes, 42 people positive for small trematode eggs (Opisthorchis viverrini, heterophyid, or lecithodendriid eggs) were treated with a 20-30 mg kg-1 single dose of praziquantel and purged. Diarrhoeic stools were then collected from 36 people (18 in each area) and searched for helminth parasites using stereomicroscopes. Faecal examinations revealed positive rates for small trematode eggs of 53.3% and 70.8% (average 65.2%) in Vientiane and Saravane Province, respectively. Infections with O. viverrini and six species of intestinal flukes were found, namely, Haplorchis taichui, H. pumilio, H. yokogawai, Centrocestus caninus, Prosthodendrium molenkampi, and Phaneropsolus bonnei. The total number of flukes collected and the proportion of fluke species recovered were markedly different in the two localities; in Vientiane, 1041 O. viverrini (57.8 per person) and 615 others (34.2 per person), whereas in Saravane, 395 O. viverrini (21.9 per person) and 155207 others (8622.6 per person). Five people from Saravane harboured no O. viverrini but numerous heterophyid and/or lecithodendriid flukes. The results indicate that O. viverrini and several species of heterophyid and lecithodendriid flukes are endemic in these two riverside localities, and suggest that the intensity of infection and the relative proportion of fluke species vary by locality along the Mekong River basin.

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