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岳阳市城区水域,是血吸虫病流行较严重的湖沼型疫区。钉螺孳生面积4002万m~2,其中距堤脚和居民点以及交通要道500m范围内的人畜常到又有阳性钉螺生长的易感地带,面积约为443万m~2。1980至1984年,急性血吸虫病发病人数101人。1985年3至10月,我们对城区湖洲易感地带进行了抽样调查。根据钉螺的环境特点,分小单元采取系统抽样(20×20m)设线设框.沿堤共抽查6760m长的湖洲,3386框,活螺框出现率为41.8％,活螺平均密度为4.38只/0.11m~2,
Yueyang City waters, is more serious schistosomiasis lake swamp epidemic. Snail breeding area of 40.02 million m ~ 2, of which from the dyke and settlements and traffic arteries within the range of human and animal husbandry often have positive snails growth susceptible area, an area of about 4430000 ~ 2.1980 to 1984 , The number of acute schistosomiasis 101 people. From March to October 1985, we conducted a sample survey of the urban lakes susceptible zone. According to the environmental characteristics of snails, the sub-unit was sampled by a system (20 × 20m) and set up a line frame along the embankment, a total of 6760m lake lanes and 3386 boxes were inspected along the embankment, the live screw frame occurrence rate was 41.8% and the average live snail density was 4.38 Only /0.11m ~ 2,