ABSTRACT
Geographic information system (CIS) was applied to analyse the endemic situation of schistosomiasis and the distribution of snails in Dali City. Hie data of endemic situation of schistosomiasis in Dali City from 2002 to 2008 were collected and a CIS database was set up. The endemic situation and the distribution of snails and acute schistosomiasis cases were analyzed by ArcGIS 9. 2 software. The results showed that the schistosomiasis transmission areas included 11 towns, 91 villages, and 401 nature villages. The trend surface analysis suggested that snail distribution in 2008 had a trend to accumulate in the northwest, while the population infection had a trend of gathering to the southeast. All acute schistosomiasis cases distributed in 6 towns, 23 villages, which showed significant aggregation by space-time clustering analysis, and three endemic villages in Xizhou Town in 2002 were identified as the first stratum endemic areas. It is concluded that CIS as database and graphics management tools can describe the epidemic situation intuitively, imaginably and macrosopically.