EPIDEMIOLOGY OF COMMON-SOURCE OUTBREAKS OF SHIGELLOSIS IN THE UNITED STATES, 1961–1975

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Abstract
In 1961–1975, there were 72 foodborne and 38 waterborne outbreaks of shigellosis reported in the United States. Foodborne outbreaks were most often caused by salads with contamination attributed to poor hygiene of a food handler. Waterborne outbreaks most often involved semipublic water systems, and were usually the result of inadequate chlorination of water contaminated by human feces. In 110 common-source outbreaks, 16, 541 persons were ill. The attack rate for both food- and waterborne shigellosis was 47%, and the casefatality ratio was 0.1% in foodborne outbreaks and 0.2% In waterborne outbreaks.

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