Abstract: Objective To analyze the current status and trend of snail distribution in Danyang City from 2016 to 2020,so as to provide basis for scientific formulation of snail control strategies after schistosomiasis elimination. Methods The data of snail monitoring and control in Danyang City from 2016 to 2020 were collected and statistically analyzed. Results Snail survey was completed in area of 7 611. 92 hm² in 12 townships from 2016 to 2020,which revealed snail presence in 138 environments in 9 townships,covering an area of 250. 59 hm². No infected snails were detected. The largest area with snail prevalence was found in Danbei Town,Lingkou Town. Qu’ a Community. Qu’ a Community,Lingkou Town and Lvcheng Town were the three towns with the largest snail environment. Marshland and inland were the major snail environment,and the marshland snail environment was concentrated in Danbei Town,accounting for 83. 39% of the local snail area. Lingkou town,Qu’a Community and Lvcheng Town were the inland areas with heavy snail burden,with an area of 35. 24%,27. 89% and 10. 53%,respectively. The area of Oncomelania hupensis snails tended to increase initially,followed by decrease. After implementation of comprehensive control measures for schistosomiasis,the area of Oncomelania hupensis was effectively reduced,with only 19. 73 hm² by the end of 2020,a decrease of 71. 78% compared with 2016. The frame with live snails and snail density were decreased by 48. 59% and 81. 25%,respectively. Conclusion Comprehensive control measures implemented in compliance with local conditions have resulted in effective control of schistosomiasis in Danyang City. Nevertheless,snail monitoring should be carried on in order to timely discover and control the snail environment,and consolidate the control efforts.

Key words: Oncomelania hupensis, Surveillance, Danyang City