Norovirus is often acquired from a contact with clinically apparent gastroenteritis. With an incubation period of 24–48 h, an exposure history to a symptomatic contact is reliable. Vomiting is ...

Background Accurate knowledge of incubation ... the median incubation period to be 4.5 days (95% CI 3.9–5.2 days) for astrovirus, 1.2 days (95% CI 1.1–1.2 days) for norovirus genogroups ...

The incubation period for a norovirus infection ranges from 12 to 48 hours. This means that a person may not show any symptoms right after being infected because the virus can take time to manifest.

It remains important to take steps to avoid passing on the infection.” Norovirus has an incubation period of 12 to 48 hours, meaning that symptoms can come on suddenly. They can include ...