Korean J Parasitol.  2007 Sep;45(3):213-218. 10.3347/kjp.2007.45.3.213.

High prevalence of liver and intestinal fluke infections among residents of Savannakhet Province in Laos

  • 1Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul, Korea. cjy@snu.ac.kr
  • 2Department of Parasitology, College of Medicine, Kangwon National University, Chuncheon, Korea.
  • 3Department of Parasitology and Institute of Health Sciences, Gyeongsang National University College of Medicine, Jinju, Korea.
  • 4Department of Parasitology, College of Medicine, Yonsei University, Seoul, Korea.
  • 5Department of Parasitology, College of Medicine, Chungbuk National University, Chongju, Korea.
  • 6Korea Association of Health Promotion, Seoul, Korea.
  • 7Department of Hygiene and Prevention, Ministry of Public Health, Vientiane, Lao PDR.
  • 8Department of Parasitology, College of Medicine, Korea University, Seoul, Korea.


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.


Opisthorchis viverrini; Haplorchis taichui; Prosthodendrium molenkampi; Phaneropsolus bonnei; prevalence; Savannakhet Province; Laos

MeSH Terms

Anthelmintics/administration & dosage
Child, Preschool
Intestinal Diseases, Parasitic/drug therapy/*epidemiology
Liver Diseases, Parasitic/*epidemiology
Middle Aged
Parasite Egg Count
Population Surveillance
Praziquantel/administration & dosage
Trematoda/classification/*isolation & purification
Trematode Infections/drug therapy/*epidemiology
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