GOLDEN, Colo. -- Norovirus has been identified as the culprit that sickened the Chatfield High School football team.

The Colorado Department of Health and Environment confirmed the presence of Norovirus in a specimen collected during the investigation and notified the Jefferson County Department of Health and Environment Friday.

About 30 people from Chatfield High School became sick following a road trip to Fort Collins on Nov. 3. Symptoms reported by the team and coaches included nausea, vomiting and diarrhea.

One student was hospitalized for dehydration, but was later released. All of those affected have recovered, or are recovering, although four of the players will miss Saturday's game.

Health officials are working to identify the source of the Norovirus.

According to the state health department, Norovirus is an easily transmitted virus that causes gastrointestinal illness, typically with sudden onset of diarrhea, vomiting and stomach cramping. Additional symptoms can include low-grade fever, chills and headache. No specific treatment is available.

Outbreaks are often seen in the winter months, especially where groups gather, such as senior centers, cruise ships, hotels, jails, schools and other locations.