Abstract: Objective To understand the current status of Oncomelania hupensis snails and the change rules， so as to provide the evidence for formulating the snail control strategy. Methods The data of snails were collected and the factors influencing the changes of snail status were investigated， and all the data were analyzed in Hailing District from 2007 to 2014. Results There were 18 environments with snails in 17 villages of 3 townships in Hailing District from 2007 to 2014. The snail area was 7.832 4 hm2. Among these environments and snail areas, 6 environments and 2.134 5 hm2, snail area were detected by the village snail investigation groups, and 12 environments and 5.697 9 hm2 snail area were detected by the township snail investigation groups. In addition, in 5 non?endemic villages, 3.126 3 hm2 snail area was found. In 2008, 2012 and 2013, a total of 2.274 0 hm2 snail area was found again. Conclusions In recent years， the snail situation rises again after schistosomiasis transmission has been interrupted. Therefore， this situation should be paid attention to.

Key words: Oncomelania hupensis； Schistosomiasis； Snail status； Hailing District

摘要： 目的 了解和掌握海陵区钉螺的分布现状和螺情变化规律，为制定控制钉螺策略提供参考依据。方法 收集整理2007-2014年海陵区螺情资料，统计并分析影响螺情变化的原因。结果 2007-2014年全区在3个乡（镇、街道）7个村查出有螺环境18处，有螺面积7.832 4 hm2，捕获并解剖钉螺数1 715只，未发现感染性钉螺。各村自查查出有螺环境6处，有螺面积2.134 5 hm2，乡（镇）级专业队复查查出有螺环境12处，有螺面积5.697 9 hm2。5个非流行村查出有螺面积3.126 3 hm2。2008、2012年和2013年复现有螺面积2.274 0 hm2。结论 血吸虫病传播阻断后螺情出现回升和反复应予以重视。

关键词: 钉螺；血吸虫病；螺情；海陵区