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作者选择了圣露西亚三个村庄,以供水和厕所设施等环境因素的差别来观察化疗后对蛔虫再感染的影响。这三个村庄的卫生设施情况分别为:1.对照村,有公用水塔给水,
The authors selected three villages in St. Lucia to examine the effects of chemotherapy on re-infection of roundworms after the chemotherapy, based on environmental factors such as water supply and toilet facilities. The sanitary conditions of the three villages are as follows: 1. The control villages have public water towers for water supply,