FISH BORNE TREMATODE INFECTION IN THAC BA LAKE – NORTHERN VIETNAM: HYPERENDEMIC ISSUE AND VARIETY ASOCIATED RISK FACTORS.

Tóm tắt

A cross sectional survey was conducted in three communes including An Phu
commune of Luc Yen district, and Bao Ai and Mong Son communes in Yen Binh district
near by Thac Ba lake of Yen Bai Province in August and September, 2019 to investigate
the FZTs (liver fluke C. sinensis and intestinal flukes included H. pumilio, H. taichui, H.
yokogawai, Procerovum varium and C. formosanus) infection status in the area and to
determine the associated risk factors of the diseases using Formaline ether concentration
technique and interview by questionnaire.
1214 individuals with an average age of 41 years old were involved in the present
study, among the participants, 47.5% were infected with FBT. By univariate analysis, the
factors were at the most significant risk of getting infected were persons who were men,
ate raw fish, prepared raw dish with fish from the lake, drank whisky with raw dish, lived
in Luc Yen District, lived next to the lake (< 500 m from house to the lake, and their age
(age of 20 – 39); breeding dog & cat, feeding dog & cat with raw fish were associated to
the FBT as well. There was no relationship between house characteristics (having hygiene
latrine or fish pond) and FBT infection.
Identification of recovered trematodes: 757 adult flukes were expelled from 6 willing
patients (R2=0.803) in the two districts, of which 20 flukes were randomly selected for
carmine stain. All stained flukes were identified as C. sinensis by the most typical
morphology traits: the tandem and dendritic testes overlap the caeca laterally and site in
the posterior third of the body.
We need conduct a prevention and control program at the Thac Ba lake for not only
human but also animal cat, dog, fish and snail asap.