Abstract: Objective Objective To analyze the changing rules of schistosomiasis endemic situation before and after reaching the crite? ria of schistosomiasis transmission controlled or transmission interrupted in Zhejiang Province，so as to provide scientific evi? dence for schistosomiasis contro1. Methods Methods Xiuzhou District and Zhuji City were selected and investigated retrospectively to collect schistosomiasis epidemiological information 10 years before they reached the criteria of transmission controlled and the subsequent years until 2008. The database of retrospective investigation was established for analyzing the trends and rules of changes of Oncomelania hupensis snail status and schistosome infection status of cattle and human. Results Results The snail status and schistosome infection kept a steady declining before reaching the criteria of transmission controlled， and there were positive correlations between the area of living snails and the infection rates of human and animal in two places（rhuman=0.764， P＜0.01， rcatlle=0.709， P＜0.01； rhuma=0.775， P＜0.01， rcatlle=0.676， P＜0.01）； No local infection person and animal except residual snails， and found 7 cases of imported infection source were found after reaching the transmission interruption. Conclusion Conclusion The epi? demic status of schistosomiasis in zhejiang is stable after reaching the criteria of transmission interruption， and residual snail are easy to re ? found and spread under some certain conditions， and some imported cases were found sometimes， which may in? crease the risks for re ? emergence of schistosomiasis. The integrated solidification strategy with emphasis on control of residu? al snails and imported cases should be taken in the areas of transmission interruption in the future.

Key words: Schistosomiasis； Epidemic situation； Retrospective investigation； Zhejiang Province

摘要： 目的 目的 分析浙江省血吸虫病流行区达到传播控制 （传控）、 传播阻断 （传阻） 前、 后螺情与病情的动态变化规律， 为血吸虫病防治工作提供科学依据。方法 方法 选择浙江省秀洲区 （水网型）、 诸暨市 （山丘型） 为调查县。采取回顾性调查 方法， 搜集整理达到传控前10年至2008年的疫情资料， 分析各县螺情、 病情变化趋势及规律。结果 结果 秀洲区和诸暨市在 达到传控标准之前， 人畜病情和螺情总体呈明显下降趋势， 且血吸虫人群感染率、 家畜感染率与钉螺面积均呈正相关关 系 （r人=0.764， P＜0.01， r畜=0.709， P＜0.01； r人=0.775， P＜0.01， r畜=0.676， P＜0.01）。达到传阻标准后有残存钉螺复现， 未 查到本地病人、 畜和感染性钉螺， 但查到7例输入性传染源。结论 结论 浙江省达到血吸虫病传阻标准以来疫情稳定； 但有 残存钉螺和外来传染源输入。血防监测巩固工作的重点是查灭残存钉螺和防控外来传染源。

关键词: 血吸虫病； 疫情； 回顾性调查； 浙江省