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

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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 bonnie (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.

Original languageEnglish
Pages (from-to)339-342
Number of pages4
JournalKorean Journal of Parasitology
Issue number4
StatePublished - Dec 2010


  • Haplorchis taichui
  • Haplorchis yokogawai
  • Laos
  • Phaneropsolus bonnei
  • Phongsali province
  • Prevalence
  • Taenia saginata
  • Trichostrongylus

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