title: A university outbreak of Escherichia coli O157:H7 infections associated with roast beef and an unusually benign clinical course.
abstract: An outbreak of Escherichia coli O157:H7 infections occurred after a graduation banquet at a university in Wisconsin. Sixty-one (32%) of 193 banquet attendees developed a gastrointestinal illness; 2 were hospitalized, none developed hemolytic-uremic syndrome or thrombotic thrombocytopenic purpura, and none died. The spectrum of illness was unusually mild, with 61% of ill persons reporting nonbloody diarrhea. A strain of E. coli O157:H7, indistinguishable from the outbreak strain by toxin type, plasmid profile, and pulsed-field gel electrophoresis, was isolated from an unopened package of an uncooked round of beef from the original shipment of meat. An investigation suggested that both undercooked roast beef and salad cross-contaminated with beef were vehicles of transmission. These findings demonstrate that meat from beef cattle may transmit E. coli O157:H7, and such infections among young to middle-aged adults may be mild and may often go undetected.
authors.affiliation: Foodborne and Diarrheal Diseases Branch, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia, USA.
authors.forename: D C
authors.initials: DC
authors.lastname: Rodrigue
authors.forename: E E
authors.initials: EE
authors.lastname: Mast
authors.forename: K D
authors.initials: KD
authors.lastname: Greene
authors.forename: J P
authors.initials: JP
authors.lastname: Davis
authors.forename: M A
authors.initials: MA
authors.lastname: Hutchinson
authors.forename: J G
authors.initials: JG
authors.lastname: Wells
authors.forename: T J
authors.initials: TJ
authors.lastname: Barrett
authors.forename: P M
authors.initials: PM
authors.lastname: Griffin
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000818:Animals; D002417:Cattle; D002648:Child; D002675:Child, Preschool; D004196:Disease Outbreaks; D004926:Escherichia coli / Q000145:classification / Q000235:genetics / Q000276:immunology; D004927:Escherichia coli Infections / Q000453:epidemiology*; D005260:Female; D005516:Food Microbiology; D006801:Humans; D007223:Infant; D008297:Male; D008460:Meat / Q000382:microbiology*; D008875:Middle Aged; D013997:Time Factors; D014675:Vegetables / Q000382:microbiology*; D014922:Wisconsin / Q000453:epidemiology