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昆山市原是血吸虫病严重流行的水网型疫区，１９７６年达到了基本消灭标准后，坚持反复查灭．１９８７～１９８９年曾连续３年未查到钉螺。１９９１年在监测查螺中，在一个村的电灌渠道及稻田查到有螺条块３３个，有螺面积１８３１７平方米，钉螺最高密度达２５０只／框（每框
Kunshan City was originally a serious epidemic of schistosomiasis water network-type epidemic area, in 1976 reached a basic standard of elimination, insisted repeatedly check out. From 1987 to 1989, snails were not found for three consecutive years. In 1991 in the monitoring snail, in a village of electric irrigation channels and rice fields found a screw block 33, snail area of 18317 square meters, snails highest density of 250 / box (each box