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王家桥镇为洲烧渠网型流行区，尽管血防部门每年组织人力、物力进行灭螺，但消灭钉螺的速度却依然赶不上钉螺扩散的速度。为了解决这个难题，在1994年一1996年查螺期间，注意观察了渠道钉螺扩散的环境条件，发现水封涵管口能有效地阻止钉螺扩散，现报告如下。1调查方法与结果1
Wangjiaqiao town Chazhou Canal network-type epidemic area, although the blood Department each organization of human and material resources to fight snails, but the speed of elimination of snails still can not keep up the speed of snail diffusion. In order to solve this problem, during the snail investigation in 1994-1996, the environmental conditions for the diffusion of channel snail were observed. It was found that the nozzle of water seal culvert effectively prevented the snail from spreading. The report is as follows. 1 survey methods and results 1