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Escherichia coli (abbreviated as E. coli) are a large and diverse group of bacteria. Although most strains of E. coli are harmless, others can make you sick. Some kinds of E. coli can cause diarrhea, while others cause urinary tract infections, respiratory illness and pneumonia, and other illnesses.
Causes and Risk Factors. The cause of E. coli infection is ingestion of a particular strain of the bacteria that produces a powerful toxin that can damage the small intestine lining. This results in bloody diarrhea. Potential sources of exposure include contaminated food and water along with person-to-person contact.