The prevailing status and risk factors analysis of the Clonorchiasis in Guangxi Autonomous Region

Objective To analyze the current status, risk factors and transmission trend of human infection of Clonorchis sinensis (C. sinensis) in Guangxi Zhuang Autonomous Region in order to provide updated information for the development of control measures. Methods A province wide survey on C.sinensis had been done. It was carried on the method of sampled by stratified random sampling based on the prevalent degree and the river valley. The fecal examination was conducted by Kato- Katz method,and the total amount of eggs was calculated.Survey of the local people and collection of the relevant data were conducted to analyze the relevant transmission factors of C.sinensis. Results A total of 13990 people from 27 villages in 9 counties (cities) were checked. The average prevalence of C.sinensis infection in the residents was 9.76% and the mean EPG(eggs per gram of faeces) was 1083.The prevalence in the male was 13.09% , 2.22 times of that in the female (5.89% ); the mean EPG in the male was 1320, 2.01 times of that in the female (658).The infection was found in every age group and remained at a higher level in adults. Among ethnical groups, On the top of the prevalence rate list is the Han nationality (11.56% ) , higher than Zhuang nationality(8.17% ), but the mean EPG in Zhuang nationality was 1470,more than Han nationality(902).The C.sinensis egg positive rates in doctors, teachers, peasants and carders remained the highest among the investigated people. Conclusions Significant difference in prevalence was found in different counties, and the prevalence is serious in certain areas in Guangxi. The adults are the main infected community. The survey revealed that eating raw fish or feeding fish with raw fecal is the main risk factor responsible for the transmission of the parasite.