Distribution of schistosome infected snails in Anhui Province / 中国血吸虫病防治杂志

ABSTRACT

Objective To understand the current distribution of infected snails in Anhui Province.Methods The data of snail survey were collected,the database was set up and the position of environments of infected snails were determined with GPS,the E-map was established with ArcGis 9.1 and the distribution of infected snail was analyzed.Results In 2007,331 environments with infected snails were found in Anhui Province,and 62.5% of them were found in the lake regions and 37.5% in the mountainous areas.The infected snail habitat areas were 682.6 hm2,85.5% of them were distributed in the lake regions and 14.5% in the mountainous areas.The river beach and the canal were the main environments with infected snails in the lake regions and mountainous areas,respectively;and 97.2% of the environments with infected snail were distributed in the infection-uncontrolled villages or villages which reached the criteria of infection control of schistosomiasis.Grassland was the main vegetation with infected snails,and the second was the reeds and trees.Conclusions The current endemic situation of the infection-uncontrolled villages or villages which reached the criteria of infection control of schistosomiasis is severe and should be emphasized for schistosomiasis prevention and control.The distribution of infected snail is connected with the river system.In the lake regions,the infected snails are distributed over the bottomlands of the Yangtze River and tributaries and islets and lakes;in the mountainous areas,the infected snails are distributed in the rivers banks and irrigated areas or special environments.