An outbreak of E. coli O111:H8 was detected among teenagers who attended a cheerleading camp between June 9 and 11. The findings of the investigation suggested a point-source exposure, however primary infection from eating a contaminated salad or corn on the cob during the first day at camp, and then later secondary spread through dinner rolls and barrel ice remained a possibility. Environmental samples failed to find any contamination. There appeared to be no problem with the water system. Inspection of the cafeteria and kitchen indicated that that there was the potential for improper cooking and temperature holding. The original source of contamination and its means of spread were undetermined.