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Is norovirus contagious before the onset of symptoms?

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Clinical information about norovirus including symptoms, immunity, and transmission. ... A person usually develops symptoms of gastroenteritis 12 to 48 hours after being exposed to norovirus. Typical symptoms—. acute-onset of vomiting; watery, non-bloody diarrhea ... Noroviruses are highly contagious. read more

According to the US CDC: It is possible for an infected person to shed norovirus before they have symptoms. However, people usually begin shedding the virus once they have symptoms. This may continue for 2 weeks or more after they recover. read more

Symptoms of gastroenteritis usually last 24 to 72 hours. People usually recover completely without any serious long-term problems. But, norovirus illness can be serious, especially for young children, older adults, and people with compromised immune systems. This can lead to severe dehydration, hospitalization, and death. read more

Norovirus is a highly contagious virus that causes vomiting and diarrhea. Learn more about the symptoms and ways to protect yourself. read more

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