Symptoms
The following symptoms usually begin from 12 hours to 3 days after you are infected:
- Diarrhea
- Fever
- Abdominal cramps
- Headache
These symptoms, along with possible nausea, loss of appetite, and vomiting, usually last for four to seven days.
Symptoms are most severe in the elderly, infants, and people with chronic conditions such as diabetes or HIV infection.