E. coli is a type of bacteria that can cause different symptoms depending on the strain of the bacteria. Some strains of E. coli cause no illness or minor illness, while others can cause serious illness. The symptoms of E. coli infection usually begin three or four days after exposure to the bacteria, but they can start anywhere from one to 14 days afterwards. The most common symptoms of E. coli infection include:

• Diarrhea, which may range from mild and watery to severe and bloody.
• Stomach cramping, pain, or tenderness.
• Nausea and vomiting, in some people.

Some people may also have a fever, fatigue, loss of appetite, or dehydration. In severe cases, E. coli infection can lead to hemolytic uremic syndrome (HUS), a potentially life-threatening complication that can cause kidney failure and other serious health problems. Symptoms of HUS include decreased frequency of urination, feeling very tired, pale skin, yellow skin and eyes, puffiness from fluid retention, and seizures. If you have diarrhea that lasts for more than three days or diarrhea that is accompanied by a fever higher than 102˚F, bloody diarrhea, or so much vomiting that you cannot keep liquids down and you pass very little urine, you should contact your healthcare provider.