A confirmed outbreak of E. coli O157:H7 occurred among people who attended a potluck meal at a Hennepin County, Minnesota, high school. There were reports of a lack of serving utensils at the event, and that utensils were used to serve multiple items. A 5-year-old child who had diarrhea prior to and during the potluck dinner. The child had self-served fruit and chips. Investigators hypothesized that the child was the most likely source of contamination. The vehicles of infection were described as baked beans and fruit. The fruit type was unknown.