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So, if people don't wash their hands well after using the bathroom, they can spread the germs to others before they even know they are going to get sick. People are contagious for at least 3 days after all stomach flu (viral gastroenteritis) symptoms have completely stopped and they feel perfectly fine2.
In the case of a norovirus infection (including Norwalk virus), a person is not usually contagious during the stomach flu incubation period. People infected with norovirus gastroenteritis are usually contagious from the moment they begin feeling ill to at least 3 days after recovery.here are a variety of viruses that cause the stomach â¦ flu (viral gastroenteritis). The incubation period for most of these viruses is 24-48 hours. However, the incubation period can occasionally be a full week.