[Analysis of surveillance of schistosomiasis in China in 2011].

OBJECTIVE:To understand the endemic situation of schistosomiasis among 81 national surveillance sites in China in 2011. METHODS:The data of the Oncomelania snail status, schistosomiasis in residents and domestic animals, and other relevant factors were collected and analyzed for the epidemic characteristics and changes in different areas in the 81 national surveillance sites in 2011. RESULTS:Among the 81 national surveillance sites, the average positive rate of residents with serum examinations and the average infection rate of the residents were 7.78% and 0.54%, respectively, and the infection rate of domestic animals was 0.97% in 2011, which all decreased compared with the rates of 2010. The area of infected snail habitats was 98.30 hm2. The mean densities of living snails and infected snails were 0.222 6 snails/0.1 m2 and 0.000 3 snails/0.1 m2, respectively. The infection rate of snails was 0.14%. The number of domestic animals opened on areas with snails was 12 422, which increased by 46.99% compared with that in 2010. CONCLUSIONS:The endemic situation of schistosomiasis improves in 2011 compared with that in 2010. However, the improvement is not great. Therefore, the management of domestic animals as the major infectious source should be further strengthened.