Analysis on the results of snail survey in schistosomiasis surveillance sites in Hubei Province in 2007

Objective To understand the characteristics and rules of the distributions of snails and infected snails in Hu- bei Province.Methods According to the scheme of the Hubei Provincial Schistosomiasis Surveillance,74 schistoso- miasis surveillance sites(villages)were selected and established.The distributions of snails and infected snails were sur- veyed using systematic and environmental sampling.Results In the 74 surveillance sites,the density of living snail was 0.474/0.1 m~2,the density of infected snail was 0.000 51/0.1 m~2,and snail infection rate was 0.107%.The densities of living snail in surveillance village of inner embankment,riverway and preventing wave forest were 0.784/0.1 m~2,0.738/ 0.1 m~2 and 0.673/0.1 m~2,respectively.The density of infected snail in riverway was 0.003 36/0.1 m~2.The infected snails were found out in 2 out of 9 surveillance sites transmission controlled.Conclusion Compared with 2006.the en- demic situation of snail was descended,but the densities of living snail in surveillance village of inner embankment,river- way and preventing wave forest were still high,the density of infected snail in riverway was also high.So snail control, especially infected snail control should be enhanced.