Abstract: Objective Objective To explore the method of Oncomelania hupensis snail surveillance in transmission? interrupted re? gions of schistosomiasis，so as to provide a new pattern for the surveillance of snail status in the transmission?interrupted areas. Methods Methods In Dongtai County，north of Jiangsu Province where the transmission of schistosomiasis was interrupted，the surveil? lance of snail status was performed by means of the village?level general survey，village?level sampling survey，snail survey in key settings of township and county，and snail reporting by residents. In addition，quality?control snail sites were set up for quali? ty control. The effectiveness and cost of the four methods of snail surveillance was compared. Results Results A total of 163 079 set? tings and 22 785.62 hm2 were surveyed in Dongtai County from 2008 to 2013，and 89 residual snail breeding sites were found， with a snail area of 1.48 hm2 . The patterns of village?level general survey，village?level sampling survey，and snail survey in key settings of township and county were employed for investigation of 94 550，45 033 and 23 496 settings，consisting of 57.98%， 27.61% and 14.41% of total settings，and 2，0 and 6 settings were found with snails，with 0.021/thousand，0，and 0.255/thou? sand detection rates of settings with snail breading sites，respectively. The pattern of snail survey in key settings of township and county was more effective than that of village?level survey to detect snail breeding sites（χ2 = 19.158，P = 0） . The recovery rate of quality?control snail breeding sites was 52.56%，38.27% and 73.62% for the three patterns of snail survey，respectively，and the pattern of snail survey in key settings of township and county showed a higher quality for snail survey than that of village?lev? el survey（χ2 = 111.597 and 85.991，both P = 0） . During the period from 2008 to 2013，289 person?times reported 279 sus? pected snail habitats and 1 501 living snails，and no Oncomelania snails were found. During the 6 ? year period，there were 1617.5，964.7 and 527.7 thousand RMB invested for village?level general survey，village?level sampling survey，and snail sur? vey in key settings of township and county，and the cost of snail survey per hm2 was 129.88，133.6 and 162.57 RMB/hm2 ，re? spectively. The cost of village?level general survey and snail survey in key settings of township and county to detect a snail?breed? ing site was 808 800 and 88 000 RMB，respectively （t = 12.850， P = 0.000），and the cost of snail survey in key settings of town? ship and county was 10.88 % of that of village?level general survey. Conclusion Conclusion The snail survey in key settings of township and county is a highly effective and high?quality method for snail surveillance，which may serve as a prior way for the surveil? lance of snail status in the transmission?interrupted areas of schistosomiasis.

Key words: Schistosomiasis；Transmission interruption； Key setting；Snail surveillance；Jiangsu Province

摘要： 目的 目的 探讨血吸虫病传播阻断地区螺情监测的方式， 为螺情监测工作提供新模式。方法 方法 选择苏北沿海达到 血吸虫病传播组断的东台市， 采用村级普查、 村级抽样调查、 市镇重点环境调查和群众报螺4种螺情监测方式， 并采用设 置质控螺点进行质量评估， 分析比较不同螺情监测方式的效果与费用。结果 结果 2008-2013年东台市共监测调查环境 163 079处， 面积22 785.62 hm2 ， 发现8个残存螺点， 钉螺面积1.48 hm2 。村级普查、 村级抽样调查和市镇重点环境调查3 种方式分别调查环境94 550、 45 033处和23 496处， 占57.98%、 27.61%和14.41%， 查出有螺环境2、 0处和6处， 螺点环境 查获率0.21个/万、 0和2.55个/万， 市镇重点环境调查螺点查获率显著高于村级普查 （χ2 = 19.158， P = 0.000）。3种方式 质控螺点回收率分别为52.56%、 38.27%和73.62%， 市镇重点环境调查质量显著优于村级查螺 （χ2 = 111.597、 85.991， P 均 = 0.000）。6年接受群众报螺289人次， 共报可疑有螺环境279个， 各类活螺1 501只， 未发现钉螺。6年村级普查、 村级抽 样调查、 市镇重点环境调查分别投入费用161.75万、 94.67万元和52.77万元， 单位面积查螺费用分别为129.88、 133.60元/ hm2 和162.57元/hm2 ； 村级普查和市镇重点环境调查查出每个螺点的费用为80.88万元/处和8.80万元/处， 差异有统计学 意义 （t = 12.850， P = 0.000）， 后者费用为前者的10.88%。结论 结论 市镇重点环境调查查螺方式效率高、 质量好， 可作为传 播阻断地区螺情监测的优选方式之一。

关键词: 血吸虫病； 传播阻断； 重点环境； 螺情监测； 江苏省