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我县历史累计有螺面积7414万m~2,病人19006人。经过三十多年的反复工作,于1976年达到基本消灭血吸虫病的标准。1987年未查到钉螺,1988年仅查到80m~2的一个螺点,1989年也只查到1260m~2的有螺面积,然而,1990年查出有螺面积达47.560m~2,1991年陡增到1062414m~2 ,有螺面积长达8000m,最高密度达20545只/m~2,是我县多年来从未发现过的严重螺情。如此大面积、高密度的螺情何以至今才被发现?现初析如下:
The county has a history of spiral area of 74.14 million m ~ 2, 19006 patients. After more than thirty years of repeated work, it basically reached the standard of eliminating schistosomiasis in 1976. Snail was not found in 1987, only a snail point of 80m ~ 2 was found in 1988, and snail area of 1260m ~ 2 was found in 1989. However, snail area was found in 1990 up to 47.560m ~ 2,1991 The annual increase to 1062414m ~ 2, with a spiral area up to 8000m, the highest density of 20545 / m ~ 2, is the county for many years has never been found in the serious spiral. Such a large area, high-density snail was discovered so far? The first analysis is as follows: