An investigation on the status of wild freshwater fish and shrimp infected with metacercaria of clonorchis sinensis in Jinhua City / 预防医学

ABSTRACT

Objective To learn the status of wild freshwater fish and shrimp infected with metacercaria of clonorchis sinensis in Jinhua city.Methods Wild freshwater fish and shrimp were randomly captured in river channel,reservoir and pond from 3 counties according to the distribution characteristics of main river system in Jinhua city.Direct tabletting microscopic examination was used to detect metacercaria of clonorchis sinensis in the muscle of wild freshwater fish and shrimp.Results A total of 1 1 kinds of wild freshwater fish and shrimp were infected with metacercariae,accounting for 61 .1 1 %(1 1 /1 8),and the total infection rate was 5.63% among 2 326 wild freshwater fish and shrimp.The infection rate of fish(8.24%)was significantly higher than that of the shrimp(2.96%)(P <0.01 ).There were significant differences in the infection rate among different counties (P <0.01 ),and the infection rate in the downstream of the water system in Wu water area (1 2.90%)was the highest.Also,significant differences were observed in infection rate among different water environments (P <0.01 ),and the infection rate of pond (1 0.1 8%)was the highest.Significant differences were observed in the infection rate among different kinds of wild freshwater fish (P =0.00),and the infection rate of side skin fish(1 7.65%)and psendorasbora parve(1 7.65%)were the highest.Conclusion There were metacercaria of clonorchis sinensis infection in wild freshwater fish and shrimp with different degrees in Jinhua city.People who ate raw or undercooked freshwater fish and shrimp may be at the risk of infection.