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１９９２年在居民感染率为２９．５％，牛血阳性率为６６．７％的重疫区村，有渠道６６条；其中有螺渠道占９６．９％，有螺面积占９９．６％；阳性螺渠道占７．８％，占有螺面积１８．７％。主要分布在支、干渠内，分别占４５．２４％、３９．８３％。支、干渠是牲畜放牧的主要场地，牛粪是污染水体感染钉螺的主要因素。支、干渠不仅感染螺平均密度及钉螺自然感染率高，而且有阳性螺的面积大，是洲垸型开放性渠道中高危易感渠道，是造成人、畜易感血吸虫的主要地带。
In 1992, there were 66 channels in the infested area where the resident infection rate was 29.5% and the cow blood positive rate was 66.7%. There were 96.9% of spiral channels and 99.6% of spiral channels, ; Positive spiral canal accounted for 7.8%, accounting for 18.7% of spiral area. Mainly distributed in branches and trunk canals, accounting for 45.24% and 39.83% respectively. Branch and canal are the main sites for livestock grazing. Cow dung is the main factor for the infection of snails in polluted water. Branch and canal not only infected with snail average density and snail natural infection rate is high, but also has a positive snail area is a high-risk channel embankment open channel susceptible to human and animal susceptible to schistosomes.