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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. Among the many strains of E. coli, only a few trigger diarrhea. One group of E. coli â which includes O157:H7 â produces a powerful toxin that damages the lining of the small intestine, which can cause bloody diarrhea.You develop an E. coli infection when you ingest this strain of bacteria.he most common way to acquire an E. coli infection is by eating contaminated food, such as: 1  Ground beef. 2  When cattle are slaughtered and processed, E. coli bacteria in their intestines can get on the meat. 3  Ground beef combines meat from many different animals, increasing the risk of contamination.