Theres too much coincidence, though. They go over there perfectly healthy and come back sick, or in some cases are now dead, Wisner said.
Most E. coli bacteria are harmless, but one strain, called E. coli O157:H7, can cause severe disease. It may cause severe stomach cramps, bloody diarrhea and vomiting. The bacteria can be spread by contaminated water, animal manure or in undercooked beef.