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1965～1966年,在罗得西亚的一个乡村,对一群非洲工人及其家属,进行了长达19个月共881个小时的人群与疫水接触的定量观察研究。观察地点和方法:所观察地区有50户约200个居民。在玛佐河经常使用的两个接触疫水地点分别各设一个观察点,在乡村综合供水卫生设施(土自来水龙头、洗衣、洗澡设施,厕所)处也设一观察点。观察时间是上午6∶00～12∶30时或下午12∶30～18∶00时,
From 1965 to 1966, a group of African workers and their families were subjected to a quantitative observation study of exposure to water for a total of 881 hours over a 19-month period in a village in Rhodesia. Observation sites and methods: The surveyed area has 50 households of about 200 inhabitants. A separate observation point is set up at each of the two sites exposed to faeces frequently used in the Mazuo River and an observation point is also provided at rural integrated water supply sanitation facilities (soil tap, laundry, bathing facilities, toilets). Observation time is 6:00 ~ 12:30 am or 12:30 pm ~ 18:00 pm,