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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.
1 E. coli cause disease by invading tissues, by producing various toxins, by adhering to tissues and by forming aggregates or clumps of bacteria. 2  Usual symptoms initially are nausea, vomiting, stomach cramps, and diarrhea. 3  Other symptoms that may occur are fever and bloody diarrhea, depending on the bacterial subtype.