Prevalent staus and trend of intestinal parasitic infection among residents in Baoan District of Shenzhen

Objective To understand the epidemic situation and trend of intestinal parasitic infection among residents in Bao'an district of Shenzhen,and provide a scientific basis for the development of control strategies.Methods A stratified cluster sampling method was conducted,and five villages from five streets were chosen as investigation spots.The feces samples of residents living in the above villages were collected for detecting parasite eggs by Kato's thick smear method.The population distribution of parasitic infections analyzed by descriptive epidemiological methods.Results A total of 1162 residents was examined,and five kinds of intestinal parasites were found.The overall prevalence was 2.84%(33/1162),of which Clonorchis sinensis infection 1.81%,Trichuris infection 0.43%,Ascaris infection 0.34%,pinworm infection 0.17% and hookworm infection 0.09%.Clonorchis sinensis was the dominant parasite species,contributed 63.6%(21/33)of total parasitic infection.The prevalence of intestinal parasitic infection in Da'lang,Sha'jing,Shi'yan,Guan'lan,and Xi'xiang streets were 4.53%,3.46%,2.92%,1.82%,and 1.31% respectively.The significant difference was observed among age groups(χ2=15.59,P0.01),residents with parasitic infection concentrated in 20 to 40 age group,and the infection rate in the males was not significant higher than that of the females(χ2=3.28,P0.05).Compared with the intestinal parasites investigation conducted in 2003,the total infection rate fell 22.22%,but that of Clonorchis sinensis infection increased by 52.10%.Conclusion The prevalence of intestinal parasitic infection in Bao'an areas was decreased,and maintained in a low level,but the prevalence of Clonorchiasis existed an upward trend.