E. Coli is a bacterium that is commonly found in the lower intestine of warm-blooded animals. Symptoms Infection typically begins three or four days after exposure to the bacteria, though you may become ill as soon as one day afterward to more than a week later. The main signs and symptoms are:
- Diarrhea, which may range from mild and watery to severe and bloody
- Abdominal cramping, pain or tenderness
- You may also have a low-grade fever or no fever.
- Some people experience nausea or vomiting.