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Escherichia coli O157:H7 is an enterohemorrhagic strain of the bacterium Escherichia coli and a cause of illness through food.[1] Infection may lead to hemorrhagic diarrhea, and to kidney failure.

E. coli serotype O157:H7 is a Gram-negative, rod-shaped bacterium. The "O" in the name refers to the cell wall (somatic) antigen number, whereas the "H" refers to the flagella antigen.