People infected with norovirus are contagious from the moment they begin feeling ill and remain contagious for at least 3 days after recovery. Some sources note that people may continue to be contagious for up to 2 weeks after symptoms resolve. The viral shedding means the virus can still be spread through stool or vomit even after a person feels better, so good hygiene is essential. Immunocompromised individuals might shed the virus for even longer, sometimes for months. Most commonly, the contagious period lasts about 48 to 72 hours after symptoms stop, but longer durations are possible. Therefore, individuals should avoid preparing food and stay away from work, school, or daycare while symptomatic and for at least 48 to 72 hours after symptoms end to reduce spreading the virus.