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The primary objective of the study was to estimate the level of infectious gastrointestinal disease attributable to drinking water. The study enrolled three groups of individuals served by different water sources. The approach was to compare rates of enteric illnesses in the three cohorts before changes were made in drinking water treatment at one site with enteric illness rates after the change occurred. A secondary objective was to determine if drinking-water-attributable endemic levels of gastrointestinal diseases are elevated in a community that uses unfiltered water from a well-protected...