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 4 to 7 days.
Symptoms are most severe in the elderly, infants, and people with chronic conditions such as diabetes or HIV infection.