2009 a mixed year for food-borne pathogens – USATODAY.com

Some frequently asked questions about E. coli: Q: What is Escherichia coli, or E. coli?A: E. coli are common, normally benign intestinal bacteria found in humans and animals, but the O157:H7 strain produces a powerful toxin that can cause bloody diarrhea, abdominal cramps and in some cases death. The O157 bacteria is virulent and tough and only a few are needed to cause illness. More:  www.usatoday.com