Abstract: Objective To analyze the Oncomelania hupensis snail distribution and the changes of snail situation in Changzhou City from 2013 to 2016， so as to provide the evidence for formulating the schistosomiasis prevention and control interventions. Methods The data of snail monitoring in Changzhou City from 2013 to 2016 were collected and statistically analyzed. Results The total area with snails was 40.17 hm2 and the newly discovered area was 30.63 hm2 in Changzhou City from 2013 to 2016. In the four years， 3 454 snails were dissected， and no schistosome infected snails were found. There were totally 51 spots with snails， and the areas with snails of different types of marshland， inland and mountain were 12.13 （30.19%）， 25.54 hm2 （63.57%） and 2.51 hm2 （6.24%）， respectively. In the newly discovered snail environment， the areas of types of marshland and inland were 8.00 hm2 （26.12%） and 22.63 hm2 （73.88%） ， respectively. The main causes for snail existence were external input and adjacent diffusion. In the past four years， the total snail control area with molluscicides was 71.74 hm2， the consolidated snail control area with molluscicides was 155.15 hm2， and the total environmental modification areas in the current snail spots and historic snail spots were 15.90 hm2 and 11.30 hm2 respectively. Conclusion The diffusion of snails in inland rivers is the key of the newly discovered snail areas in Changzhou City in recent years， and the snail monitoring and control measures should be strengthened in the future.

Key words: Schistosomiasis； Oncomelania hupensis； Surveillance； Snail control； Changzhou City

摘要： 目的 分析常州市2013-2016年钉螺分布和螺情变化情况，为制定防控措施提供科学依据。方法 收集2013-2016年常州市的螺情监测资料并进行统计分析。结果 2013-2016年常州市共查出有螺面积40.17 hm2，其中新发现有螺面积30.63 hm2。4年全市共解剖钉螺3 454只，未发现感染性钉螺。全市共查到有螺环境 51个，其中江湖滩、内陆、山丘类型的有螺面积分别为12.13（30.19%）、25.54（63.57%）、2.51 hm2（6.24%）。新发现有螺环境中，江湖滩、内陆类型的面积分别为8.00（26.12%）、22.63 hm2（73.88%）。有螺原因主要是外来输入和邻近扩散。4年药物灭螺面积共计71.74 hm2，巩固药物灭螺面积155.15 hm2，改造有螺环境面积15.90 hm2，改造历史有螺环境面积11.30 hm2。结论 内陆河道钉螺扩散是近年常州市新发螺情的关键，必须需加强监测和控制力度。 　

关键词: 血吸虫病；钉螺；监测；灭螺；常州市