Gastroenteritis, often called stomach flu, is contagious from the time symptoms start and can remain contagious for several days to up to two weeks after symptoms have resolved. Most people are contagious while experiencing symptoms such as vomiting and diarrhea and remain contagious for about 48 to 72 hours after recovery. Some viruses, like norovirus, can be shed and potentially contagious for up to two weeks or even longer, especially in immunocompromised individuals. Good hygiene, especially handwashing, is crucial throughout the illness and recovery to prevent spreading the infection.
