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目的掌握钉螺在湘江洲滩的扩散趋势及程度。方法借鉴血防站2005-2008年其监测区域内湘江洲滩的螺情资料,结合2009年本课题组的现场调查,分析比较5年来长沙-衡阳段湘江洲滩钉螺孳生情况的变化、扩散趋势。结果2009年春季本课题组对长沙-衡阳段湘江流域洲滩的实地调查中未发现钉螺孳生。从此河段各地区血防部门获取的资料结合2009年本课题组调查的情况汇总分析显示湖南长沙-衡阳段湘江流域洲滩的“有螺框出现率”2005-2009年基本呈下降趋势;“活螺率”各洲滩之间的差异较大;除鹅洲外的其它8个洲滩的“活螺平均密度(只/0.1m2)”2005-2009年均呈下降趋势;钉螺的总体分布区域五年来无扩散且无阳性钉螺。结论钉螺在湖南湘江沿岸长沙-衡阳段无明显扩散,此区域内洲滩的钉螺孳生情况取得了较好的控制效果。
Objective To understand the trend and extent of snail spread in Xiangjiang Island beach. Methods Based on the snail data from Xiangjiang Island beach in the monitoring area during 2005-2008 from 2005 to 2008 in our country, combined with field investigation conducted in 2009 by our research group, we analyzed and compared the changes and spread trends of the snail breeding in Changsha and Hengyang during the past five years. Results In the spring of 2009, our research group did not find snail breeding in the field investigation of the beach in Xiangjiang River of Changsha-Hengyang section. The data obtained from the blood and defensive departments of all the regions in this section, combined with the survey conducted by our research group in 2009, show that the occurrence rate of “screwed-frame ” in Xiangtan bank of Changsha-Hengyang section in Hunan Province is basically declining from 2005 to 2009; The difference between the continents and beaches is larger. The average live density (only /0.1m2)s for the other eight beaches except Goose Island was decreased from 2005 to 2009 ; Snail the general distribution of the area in five years no proliferation and no positive snails. CONCLUSIONS Oncomelania did not spread significantly in the Changsha-Hengyang section of the Xiangjiang River in Hunan Province, and the control of snail breeding in Chaoban Beach in this area had achieved good results.