Abstract
Field studies in two rural communities in the Pacific lowlands have been in process since 1973 to evaluate the relationship between environmental improvements, particularly a piped water supply, and the prevalence of diarrheal diseases. An initial appraisal of the data indicates that diarrheal diseases in the tropics vary with the dry and rainy seasons. However, there are aspects of the relationship between water and diarrheal disease which still require explanation. The field studies are designed to provide further insight into these seasonal influences as well as to variations which are related to epidemic cycles, environmental factors and the range of socio-economic development in these areas.
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