RESUMO
Objective To further master the Oncomelania hupensis snail situation in Huizhou District,so as to provide the ev-idence for improving the prevention and control work. Methods According to the prevalence of schistosomiasis in history and the characteristics of residual snail points in recent years,the snail surveys were carried out with the environmental sampling and sys-tematic sampling method in history snail environments and their surrounding suspicious environments. Results Totally 5 298 940 m2 in 12 administrative villages of 3 townships were investigated and there were 24 406 m2 snail areas at 5 remaining snail spots in 4 administrative villages. The highest snail density was 283 snails/0.1 m2,and the average density of living snails was 2.31 snails/0.1 m2. A total of 4 303 snails were captured,1 534 were checked by microscopy,and no infected snails were found. Conclu-sion The snail situation is still not stable in Huizhou District,and the monitoring of snail situation still need to be strengthened.
RESUMO
The historical surveillance results showed, there were 10 schistosomiasis cases in Huangshan City from 1994 to 2006. The survey in 2007 showed, the positive rates of blood examination for schistosomiasis in migrant workers and immigrant workers were 0.49% and 0.47% , respectively, but no schistosome-infected patients were detected by using the stool examination. An area with snails of 3 000 m~2 was found in the residence of the immigrant workers, but no infected snails were found. It is indicated that the mobile population has some impact on the transmission of schistosomiasis in the transmission-interrupted area. The surveillance and health education for the mobile population should be strengthened, and the imported infectious source should be prevented.