Symptoms of norovirus illness usually begin 24 to 48 hours after ingestion of the virus, but may appear in as little as 12 hours after exposure. The illness is usually brief, lasting 1 to 2 days; however, individuals may remain contagious from the moment they become ill to three days after recovery. The most common symptoms of norovirus illness include:
- Stomach cramping
Sometimes, norovirus can cause a low-grade fever, chills, headache, muscle aches, and fatigue. Dehydration can also occur, which may require hospitalization. There are no long-term effects resulting from norovirus illness.