临湘县属湖沼型血吸虫病流行区,分湖滩垸内、湖汉亚型。基本消灭血吸虫病后,于1984～1988年进行了连续五年的疫情监测。 螺情监测 片状地型以5×5m设框波线,带状地型沟渠等隔5m查0.33m断面。五年中共查可疑环境5113.04万m~2,发现有螺区,垸内一处21.67万m~2。垸外三处5.33万m~2。以单盲法用标志死螺设置假螺点控制查螺质量,其设置范围按公式 Linxiang County is a lacustrine schistosomiasis epidemic area, sub-lake embankment, Lake sub-type. After basically eliminating schistosomiasis, surveillance of epidemics was conducted for five consecutive years from 1984 to 1988. Looping monitoring Flake to 5 × 5m set frame waves, strip-shaped ditch to check 5m interval 0.33m section. In five years, 51,410,400 m 2 suspicious environments were investigated, and a spiral zone was found, with a total area of ​​216,700 m 2. The embankment outside the three 53,300 m ~ 2. The single blind method is used to set the dead screw to control the quality of the check screw. The setting range is according to the formula