Hyperendemicity of Haplorchis taichui Infection among Riparian People in Saravane and Champasak Province, Lao PDR.
10.3347/kjp.2013.51.3.305
- Author:
Jong Yil CHAI
1
;
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
Author Information
1. Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, Seoul 110-799, Korea.
- Publication Type:Original Article
- Keywords:
Haplorchis taichui;
Haplorchis pumilio;
Opisthorchis viverrini;
Centrocestus formosanus;
hyperinfection;
prevalence;
riparian people;
Saravane province;
Champasak province;
Lao PDR
- MeSH:
Adolescent;
Adult;
Aged;
Aged, 80 and over;
Animals;
Child;
Demography;
Endemic Diseases/*statistics & numerical data;
Feces/parasitology;
Female;
Humans;
Laos/epidemiology;
Male;
Middle Aged;
Parasite Egg Count;
Rivers;
*Trematoda;
Trematode Infections/*parasitology;
Young Adult
- From:The Korean Journal of Parasitology
2013;51(3):305-311
- CountryRepublic of Korea
- Language:English
-
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.
