苏丹吉齐拉灌溉区内,某些村庄中的曼氏血吸虫病感染率超过70%,在8～10岁儿童中可达86%。埃及血吸虫病感染率较低。1955～1956年,进行了大规模的硫酸铜杀螺,以后又以硫酸铜作为化学屏障间歇施用,并在主河道上建起机械屏障以防螺蛳再侵入。然而,目前曼氏血吸虫病的患病率以及扁卷螺Biomphalaria pfeifferi和膀胱螺 The prevalence of schistosomiasis in some villages in more than 70% of the villages in Sudan’s Gizira irrigation area is up to 86% in children aged 8-10 years. Infectious rates of schistosomiasis in Egypt are low. Between 1955 and 1956, large-scale copper sulfate killings were conducted, and later copper sulphate was used as a chemical barrier intermittently. A mechanical barrier was built on the main river to prevent reintroduction. However, at present the prevalence of Schistosoma mansoni as well as the prevalence of Biomphalaria pfeifferi and bladder snail