Authors: Daixiong Chen Jieyun Chen Ji Huang Xueying Chen Dana Feng Baofang Liang Yuchuan Che Xiaodan Liu Cuihua Zhu Xiaomin Li Haoxian Shen
Publish Date: 2010/06/12
Volume: 107, Issue: 4, Pages: 835-839
Abstract
Pearl River Delta region is a high clonorchiasisendemic area in China However no complete epidemiological data exist regarding its infection in freshwater fishes an important epidemic factor for Clonorchis sinensis The present study collected freshwater fishes and shrimps from 32 sites of nine cities in the Pearl River Delta and the encysted metacercariae of C sinensis were detected by digesting these specimens with artificial gastric juice The mean infection rate of freshwater fishes was 3709 2160/5824 with a mean number of 14269 encysted metacercariae in every infected fish and 0460 encysted metacercariae in every gram of fish meat Of these freshwater fishes 5219 were domesticated and the infection rate was 3669 with a mean number of 10743 encysted metacercariae in every infected fish and 0312 encysted metacercariae in every gram of fish meat the other 605 were wild and the infection rate was 4050 with a mean number of 41829 encysted metacercariae in every infected fish and 8812 encysted metacercariae in every gram of fish meat A total of 228 shrimps were examined and 307 of them were infected with a mean number of 100 encysted metacercariae in every infected shrimp Pseudorasbora parva and Ctenopharyngodon idellus had the highest infection rate and degree of infection in the fishes studied The results demonstrated a high incidence of C sinensis infection in freshwater fishes and shrimps within Pearl River Delta region and a great difference in the infection rate among different collection sites and different fish species
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