| multistate outbreak of escherichia coli o157:h7 infections associated with a national fast-food chain, 2006: a study incorporating epidemiological and food source traceback results. | a multistate outbreak of escherichia coli o157:h7 infections occurred in the usa in november-december 2006 in patrons of restaurant chain a. we identified 77 cases with chain a exposure in four states - delaware, new jersey, new york, and pennsylvania. fifty-one (66%) patients were hospitalized, and seven (9%) developed haemolytic uraemic syndrome; none died. in a matched analysis controlling for age in 31 cases and 55 controls, illness was associated with consumption of shredded iceberg lettuce ... | 2011 | 20429971 |