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Hyperendemicity of Haplorchis taichui Infection among Riparian People in Saravane and Champasak Province, Lao PDR

Authors
 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 
Citation
 KOREAN JOURNAL OF PARASITOLOGY, Vol.51(3) : 305-311, 2013 
Journal Title
KOREAN JOURNAL OF PARASITOLOGY
ISSN
 0023-4001 
Issue Date
2013
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
Keywords
Centrocestus formosanus ; Champasak province ; Haplorchis pumilio ; Haplorchis taichui ; Lao PDR ; Opisthorchis viverrini ; Saravane province ; hyperinfection ; prevalence ; riparian people
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.
Files in This Item:
T201303704.pdf Download
DOI
10.3347/kjp.2013.51.3.305
Appears in Collections:
1. College of Medicine (의과대학) > Dept. of Tropica Medicine (열대의학교실) > 1. Journal Papers
Yonsei Authors
Kim, Tae Yun(김태윤)
Yong, Tai Soon(용태순) ORCID logo https://orcid.org/0000-0002-3445-0769
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/88310
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