E. coli is a type of bacteria that normally live in the intestines of people and animals. However, some types of E. coli, particularly E. coli 0157:H7, can cause intestinal infection.Symptoms of intestinal infection include diarrhea, abdominal pain, and fever.More severe cases can lead to bloody diarrhea, dehydration, or kidney failure.People with weakened immune systems, young children, and the elderly are at increased risk for developing these complications.ymptoms of intestinal infection include diarrhea, abdominal pain, and fever. More severe cases can lead to bloody diarrhea, dehydration, or kidney failure. People with weakened immune systems, young children, and the elderly are at increased risk for developing these complications.