坦桑尼亚北部一个甘蔗园于1968～70年进行了有计划的血防工作。经过常规药物灭螺后扁卷螺密度减少到很低的水平。同时对居民进行粪检普查,并进行治疗。防治效果是根据1969年初尚未开展工作时和1970年底的流行情况进行抽样调查比较的结果。粪检普查占人口的90%以上,对1,922例病人共进行了2,286疗程的治疗。园地工人的患病率从1969年的59%下降至1970年的31%。非园地工人的患病率从36%下降至 A sugar cane garden in northern Tanzania conducted a planned blood-shelter work in 1968-70. After conventional drug snail snail density reduced to a very low level. At the same time on the residents of census census, and treatment. The effectiveness of the control measures is based on a comparison of sampling surveys based on the prevalence of unworked work at the beginning of 1969 and the end of 1970. Surveillance census accounted for more than 90% of the population, a total of 1,922 patients treated 2,286 courses of treatment. The prevalence of garden workers dropped from 59% in 1969 to 31% in 1970. The prevalence of non-farm workers dropped from 36% to