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We describe an  Escherichia coli  O157[ratio   ]H7 outbreak associated with a fresh water lake at a county park. Campers were surveyed for diarrhoeal illness within 10 days of their visit, and a case-control study of day visitors was conducted. A confirmed case was a symptomatic person with a stool culture positive for  E. coli  O157[ratio   ]H7 and a probable case was a person with bloody diarrhoea. Clinical isolates of  E. coli  O157 were subtyped by pulsed field gel electrophoresis (PFGE). In the camper survey, 12 (38%) of 32 swimmers had a diarrhoeal illness (relative risk [RR]=12·4; 95% confidence interval [RR]=1·7–89·7). For the case-control study, the 12 cases were more likely than controls to have purposefully ingested lake water (odds ratio [OR]=6·9, 95% CI=0·9–55·8). The PFGE patterns of six clinical isolates were indistinguishable. This report further demonstrates that contaminated fresh-water lakes can be the source of community outbreaks of  E. coli  O157[ratio   ]H7.

epidemiology and infection

Swimming-associated haemorrhagic colitis due to <i>Escherichia coli</i> O157[ratio ]H7 infection: evidence of prolonged contamination of a fresh water lake

Swimming-associated haemorrhagic colitis due to Escherichia coli O157[ratio ]H7 infection: evidence of prolonged contamination of a fresh water lake