Investigation of infection with Clonorchis sinensis in freshwater fish from Xianning City

Objective To determine the prevalence of encysted metacercariae of Clonorchis sinensis in the City of Xianning and to provide a scientific basis for the prevention of clonorchiasis.Methods Freshwater fish that were regularly consumed were obtained from randomly selected four markets in different locations in Xianning City;the fish included Aristichthys nobilis,Carassius auratus,Megalobrama amblycephala,and Pseudorasbora parvae.Encysted metacercariae of C.sinensis were detected in fish meat and counted using an inverted microscope.Results Seventy-six samples of A.nobilis,87 samples of C.auratus,92 samples of M.amblycephala,and 189 samples of P.parva were tested.The four species of freshwater fish were infected with C.sinensis at a rate of 23.68%,43.68%,39.13%,and 75.13%.The number of each species of fish that were infected was 15.11,9.97,10.06,and 48.25.Conclusion Freshwater fish are infected with C.sinensis in Xianning City.P.parva had a higher rate of infection than did other fish species.