Scientists at Evergreen State College in Olympia, Wash., have discovered a way to kill harmful E. coli bacteria in animal digestive tracts without harming the animals. They introduced an otherwise harmless virus called a phage that specifically attacks E. coli and eliminates it, but leaves all other food-digesting bacteria alive and well. This may someday significantly reduce the odds of E. coli entering the human-food chain.  For more, follow this link.