You typically get diarrhea, fever, and stomach cramps. You also may have headache, nausea, and vomiting. Symptoms start between 6 hours and 4 days after the bacteria infects you. You usually feel better in about a week, though it can take a few months for your bowel movements to return to normal. Sometimes infections spread to your blood, bones, joints, brain, or nervous system and cause long-term symptoms affecting those areas.