http://www.cdc.gov/mmwr/preview/mmwrhtml/00037189.htm

On August 8, 1994, the Virginia Department of Health was notified that several campers and counselors at a summer camp had developed bloody diarrhea. The outbreak began during the July 17-30 session at a rural camp where activities included frequent overnight trips at which meals were cooked over a campfire. This report summarizes the findings from the investigation, which confirmed E. coli O157:H7 as the causative agent.