To assess the role of parasites in causing diarrhea in Peace Corps volunteers in Guatemala, 115 stool specimens from a case-control investigation (48 case [diarrhea] and 26 control episodes) were examined. A potentially pathogenic protozoan that could account for diarrheal illness was found for only 12% of the case episodes.
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Herwaldt et al. (1994) studied this question.
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