该流行区系巴西东南部的Peri-Peri村,有两条小溪流,居民用来灌溉、游泳和洗物等。1974年～1987年,每隔2～6年查螺一次,一经发现即用氯硝柳氨处理。当地居民每年粪检1次,每份作2张涂片,用加藤氏法检查并计算每克虫卵数。1974年全村人口622人,1987年598人。曼氏血吸虫感染率从43.5%(1974年)降为4.4%(1987年),阳性者虫卵几何均数(EPG)亦由281降为147。不论是首次 The popular area is Peri-Peri village in southeastern Brazil, with two streams that residents use for irrigation, swimming and washing. From 1974 to 1987, every 2 to 6 years check snail, once discovered that use niclosamide treatment. Local residents every 1 fecal examination, each for two smears, with Kato’s method to check and calculate the number of eggs per gram. The village had a population of 622 in 1974 and 598 in 1987. The infection rate of Schistosoma mansoni decreased from 43.5% (1974) to 4.4% (1987), and the positive geometric mean (EPG) of eggs dropped from 281 to 147. No matter for the first time