Outbreaks of the gastrointestinal illness are surging both at sea and on land. Here's what to know.

Having this virus is bad enough at home, where you might spend hours hugging the toilet. Imagine having it out camping. Investigators wanted to find out how backpackers were getting and spreading it.

A multistate outbreak of norovirus illnesses linked to raw oysters from Canada is under investigation in 13 states by the FDA.