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上海市金山县现有19个乡镇、236个村、47万多人口。原有16个乡镇、161个村流行血吸虫病,历史有螺面积1100多万平方米,历史血吸虫病人13.5万多人,其中晚血病人4000多人,是一个血吸虫病严重流行县。经过30多年的积极防治,到1983年止,各流行乡镇都先后达到了消灭血吸虫病的指标要求。我县消灭血吸虫病后,在一些历史上属血吸虫病轻流行或非流行的乡镇中,每年仍查到残存钉螺,且个别地区有螺面积较大,钉螺密度较高。为此,我们转换防治机制,
Jinshan County, Shanghai’s existing 19 towns, 236 villages, more than 470,000 people. The original 16 townships, 161 village epidemic of schistosomiasis, the history of a snail area of more than 11 million square meters, history of schistosomiasis more than 135,000 people, of which more than 4,000 people with late blood, is a serious epidemic of schistosomiasis counties. After more than 30 years of active prevention and treatment, by 1983, all endemic towns and townships had successively met the targets for eliminating schistosomiasis. After the county exterminated schistosomiasis, in some townships that historically belonged to light-endemic or non-endemic schistosomiasis, surviving snails were still found each year, and snail areas were larger in some areas with higher snail density. To this end, we change the prevention and control mechanism,