Abstract: Objective To understand the epidemic situation following reemergence of Oncomelania hupensis and the control effect of schistosomiasis in Yingde area for developing the prevention and control measures in following work. Methods The data,including survey and eradication of Oncomelania hupensis,surveillance results in population and livestock as well as wild feces,were collected from 2019 to 2020,and analyzed to estimate the risks of schistosomiasis occurrence and transmission in Yingde area. Results Oncomelania hupensis were reemerged in a total of 105 648. 94 m² in 2019,yet no living snails were detected by the end of May of 2020 after molluscicidal elimination. No infected snails were found in a total of 6 949 live Oncomelania hupensis detected. 2 503 permanent residents in the historical epidemic area and 418 floating people underwent blood test using IHA,which indicated positive serology rate by 0. 20%(5 / 2 503) and 0. There was no positive findings by stool examination. Also,155 livestock around the epidemic village received antibody test for schistosomiasis, which indicated totally negative results. Test of the 200 aliquots of wild feces also showed negative findings. The correct knowledge rate for schistosomiasis prevention and control was 95. 17% and 96. 77%,respectively,in villagers and primary school students within or neighboring the endemic areas. The risk for schistosomiasis transmission was rated as grade Ⅲ in Yingde area. Conclusion Oncomelania hupensis prevalence has been effectively controlled in Yingde City. Following efforts should be focused on surveillance over the imported transmission sources,strengthened monitoring of the snail status and maintenance of facilities in the targeted areas.

Key words: Schistosomiasis, Oncomelania hupensis, Management, Risk analysis