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尽管1979年“蓝色尼罗河卫生方案”有效地防止了血吸虫病患病率的上升,但是“Rahad灌溉规划”的建立,却使某些村庄血吸虫病的患病率上升到较高的水平。在村庄附近人接触水的地方常常发现感染曼氏血吸虫的菲氏双脐螺与感染埃及血吸虫的截形小泡螺且数量很多。本文作者通过分析螺密度(降低率)及已灭螺地区重新有螺的比率,对灌溉渠道实行局部灭螺的可行性及效果进行
Although the Blue Nile Health Program in 1979 effectively prevented an increase in the prevalence of schistosomiasis, the establishment of the Rahad Irrigation Plan has raised the prevalence of schistosomiasis in some villages to higher levels. In the vicinity of the village where people come into contact with water, it is common to find a large number of trichomes of the genus Schizothoracicas which are infected with Schistosoma mansoni and those infected with Schistosoma mansoni. The author of this paper analyzed the feasibility of the local snail control in irrigation channels by analyzing the density of snails (reduction rate) and the ratio of snails in molluscum