People with gastroenteritis (stomach flu) are typically contagious from the moment symptoms appear and can remain contagious for several days after symptoms have resolved. For common viruses like norovirus and rotavirus, contagiousness can last from a few days up to two weeks or more. Norovirus, the most common cause, can be shed in stool for up to two weeks after recovery, making a person potentially contagious during this time. It is recommended to stay isolated and maintain good hygiene, especially for at least 48 hours after symptoms cease, to reduce the risk of spreading the virus to others.
Contagious Period Details
- Symptoms usually begin 1 to 3 days after exposure.
- The viral shedding (e.g., norovirus) can continue in stool for weeks after symptoms end.
- Most people are most contagious during active symptoms and up to 2-3 days after symptoms stop.
- Some viruses can be contagious even before symptoms appear.
- Children should stay home from school or daycare for at least two days after the last episode of vomiting or diarrhea.
Prevention
- Strict hand washing and disinfecting surfaces are vital to prevent spreading.
- Avoid close contact with others during the contagious period.
- Persons with gastroenteritis should not prepare food while symptomatic and for several days after recovery.
In summary, a person with gastroenteritis is contagious from symptom onset through several days after recovery, potentially up to two weeks depending on the virus type, with the highest contagiousness during active symptoms and immediate recovery phase.
