Epidemiology of common-source outbreaks of shigellosis in the United States, 1961-1975.
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 case-fatality ratio was 0.1% in foodborne outbreaks and 0.2% in waterborne outbreaks.
D004196:Disease Outbreaks / Q000453:epidemiology*; D004405:Dysentery, Bacillary / Q000453:epidemiology* / Q000209:etiology; D005506:Food Contamination; D005511:Food Handling; D006801:Humans; D012763:Shigella flexneri; D012764:Shigella sonnei; D014871:Water Microbiology; D014881:Water Supply