为了解我县钉螺分布的变化趋势,探讨控制钉螺的有关措施和对策,我们对2002~2009年全县钉螺调查资料进行了整理分析,现报告如下。1资料及方法1.1资料来源2002~2009年全县钉螺调查资料。1.2查螺方法分单元采用系统抽样法查螺,框、线距江、湖、洲滩一般为10m×10m或20m×20m,部分 In order to understand the changing trend of the snail distribution in our county and to explore the relevant measures and countermeasures to control snail, we conducted a survey and analysis of the snail survey data from 2002 to 2009 in our county. The report is as follows. 1 materials and methods 1.1 sources 2002 to 2009, the county snail survey data. 1.2 Snail search method Sub-unit using the system sampling method snail, box, line spacing River, lake, beach is generally 10m × 10m or 20m × 20m, part of