Prevalence and Intensity of Fish-Borne Zoonotic Trematodes in Cultured Freshwater Fish From Rural and Urban Areas of Northern Vietnam

Tháng Mười 11, 2017

Prevalence and Intensity of Fish-Borne Zoonotic Trematodes in Cultured Freshwater Fish
From Rural and Urban Areas of Northern Vietnam

Nguyen Van De, Thanh Hoa Le*, and K. D. Murrell`, Department of Parasitology, Hanoi Medical University, 01. Ton Taht Tung Street, Hanoi,
Vietnam;
*Institute of Biotechnology of Vietnam, 18 Haong Quoc Viet Road, Hanoi, Vietnam; Department of Veterinary Pathobiology, Faculty of Life
Science, University of Copenhagen, Denmark;
`to whom correspondence should be addressed. e-mail: kdmurrell@comcast
ABSTRACT: Consumption of raw freshwater fish produced in both rural
farm and urban wastewater ponds is a common practice in Vietnam. The
present study assessed the risk of fish-borne zoonotic trematode (FZT)
infection from fish raised in both these aquaculture systems in northern
Vietnam. The diversity, prevalence, and infection intensity of FZT
metacercariae in 1,500 freshwater fish collected from 6 sites located in
rural and urban areas in northern Vietnam were investigated. The specific
diagnosis of species was made by morphologic methods. The overall FZT
prevalence in fish from both urban wastewater ponds and rural farm
ponds was 11.2
%. In wastewater ponds, the overall prevalence was 5.1%,
ranging from 2.0
% in tilapia to 7.3% in common and grass carp. In fish
from farm ponds, the prevalence was 17.3
%, and ranged from 6.7% in
mud carp to 26.7
% in common carp. The mean intensity of FZT infection
was also higher in fish from farm ponds than that in fish from wastewater
ponds (6.0
% and 8.4%, respectively). The FZT species recovered from
infected fish included both liver (
Clonorchis sinensis) and intestinal flukes
(
Haplorchis taichui, Haplorchis pumilio, and Centrocestus formosanus). The
prevalence of FZT in fish raised in these common farm systems represents
a significant public health risk for a population with a strong cultural
preference for consuming raw or inadequately prepared fish. These
research results should encourage the public health and agriculture sectors
to conduct the risk factor research required to develop control programs
for FZT.

https://drive.google.com/file/d/0BwAVbkCHjoJ8RzR0ejFOWlBjM28/view?usp=sharing