incubation period for viral gastroenteritis
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.