An outbreak due to multiple pathogens was associated with participation at a farm day camp. The camp was sponsored by a university and was held on campus for young children. There were eight camps sessions scheduled throughout the summer. Although children had contact with a variety of animals, the primary attraction of the camp was that each child was responsible for care of a calf. Multiple pathogens were found in the stool samples of camp attendees. Cryptosporidium parvum, Campylobacter, Salmonella Typhimurium, E. coli O111:H8, E. coli O111:NM and E. coli O51:H11 were isolated in campers. These pathogens were also isolated from the calves.