Norovirus Outbreaks

CDC updates this page regularly on norovirus outbreaks. Learn more about how to respond to and report outbreaks.

What is a Norovirus Outbreak?

An outbreak of norovirus is defined as an occurrence of two or more similar illnesses resulting from a common exposure that is either suspected or laboratory-confirmed to be caused by norovirus.

Current Outbreaks

There are no open investigations.

Previous Outbreaks