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

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30 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)305-311
Number of pages7
JournalKorean Journal of Parasitology
Volume51
Issue number3
DOIs
Publication statusPublished - 2013 Jun

All Science Journal Classification (ASJC) codes

  • Parasitology
  • Infectious Diseases

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    Chai, J. Y., Yong, T. S., Eom, K. S., Min, D. Y., Jeon, H. K., Kim, T. Y., Jung, B. K., Sisabath, L., Insisiengmay, B., Phommasack, B., & Rim, H. J. (2013). Hyperendemicity of Haplorchis taichui infection among riparian people in Saravane and Champasak province, Lao PDR. Korean Journal of Parasitology, 51(3), 305-311. https://doi.org/10.3347/kjp.2013.51.3.305