Fenwick A
Bull World Health Organ. 1972;47(3):325-30.
Three methods were used to measure the level of transmission of infections of Schistosoma mansoni on an irrigated sugar estate in northern Tanzania. The studies were carried out over a period of 3 years, during a programme for the control of the host snail Biomphalaria pfeifferi. During the second and third years a mass diagnosis and treatment campaign against the infection was also carried out. Examinations for infection were made in newly employed subjects on arrival and after 6 and 12 months. Two studies were made in young children at an interval of 18 months, to determine age prevalence curves. In the third method, subjects were examined for infection 18 months after being found free from infection in a previous survey. Results are compared with data recorded in a previous study, made before snail control was commenced. The results suggest that the control programme has led to a great reduction in the incidence of S. mansoni on the estate.
在坦桑尼亚北部一个灌溉甘蔗种植园，采用了三种方法来测量曼氏血吸虫感染的传播水平。这些研究在3年期间进行，当时正开展一项控制中间宿主蜗牛费氏泡螺的计划。在第二年和第三年，还开展了针对该感染的大规模诊断和治疗行动。对新入职人员在入职时以及6个月和12个月后进行感染检查。对幼儿进行了两项间隔18个月的研究，以确定年龄患病率曲线。在第三种方法中，对在先前调查中被认定未感染的受试者在18个月后进行感染检查。将结果与在开始蜗牛控制之前进行的先前研究中记录的数据进行比较。结果表明，控制计划已使种植园曼氏血吸虫的发病率大幅降低。
