有螺沟渠硬化后钉螺复现原因

目的 目的 了解有螺沟渠硬化后钉螺复现的影响因素， 提出改进措施， 提高沟渠硬化工程的灭螺效果。方法 方法 采用回顾性调查与现场调查相结合的方法， 收集荆门市13个血吸虫病流行区乡 （镇） 实施沟渠硬化灭螺工程和螺情资料， 统计沟渠硬化工程的灭螺效果， 分析钉螺复现的原因。结果 结果 共调查151条硬化沟渠， 71条沟渠钉螺复现， 复现沟渠条数占 47.02%。钉螺面积灭光率为78.79%。钉螺复现的主要原因为上游螺区扩散、 硬化沟渠破损、 工程前未药物灭螺和施工带入钉螺等。结论 结论 单纯硬化有螺沟渠并不能彻底消灭钉螺； 科学规划沟渠硬化工程、 工程前药物灭螺和加强工程后期维护是提高灭螺效果的关键。

Causes of re-emergence of Oncomelania snails in hardened ditches

Objective To understand the impact factors of the re?emergence of Oncomelania snails in hardened ditches so as to find out the measures to improve the effect of snail eradication. Methods Thirteen infected townships from Jingmen City were randomly selected and investigated with the retrospective method and the field survey. All the data were analyzed for evaluating the effect of the hardened ditches on snail eradication and finding out the causes of the re?emergence of snails in hardened ditches Re? sults After on?site investigation of 151 hardened ditches，the eradication rate of snail areas was 78.79%，and 71 ditches were founded with snails and the re?emergence rate was 47.02%. The major factors of the snail re?emergence were the spread of the snails from the upstream，the dilapidation of the hardened ditches，no using molluscicides before the hardened ditches，and the snails being brought by the engineering construction. Conclusions The only hardened ditches can not eradicate the snails. We should manage an overall plan when processing the ditches hardening project，implementation with molluscicides before the proj? ect and strengthen the maintenance of the hardened ditches.