How long does it take for symptoms to show up after E. coli O157:H7 infection?

On average, symptoms from E. Coli O157:H7 infection develop within 3 to 4 days of eating contaminated food, with a range of 1 to 10 days. Symptoms usually include severe bloody diarrhea and abdominal cramps; sometimes the infection causes non-bloody diarrhea or no symptoms.

Usually little or no fever is present, and the illness resolves in 5 to 10 days. In some people, the infection can also cause a complication called hemolytic uremic syndrome (HUS), in which the red blood cells are destroyed and the kidneys fail. More.

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