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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.
Escherichia coli Facts and Overview. 1  E. coli are gram-negative bacteria found worldwide. 2  There are many subtypes of this bacterial species that cause a wide variety of diseases in humans. 3  The bacteria can be transmitted person-to-person and by contaminated food and water.scherichia coli Facts and Overview. 1  E. coli are gram-negative bacteria found worldwide. 2  There are many subtypes of this bacterial species that cause a wide variety of diseases in humans. 3  The bacteria can be transmitted person-to-person and by contaminated food and water.