The CDC records an outbreak when at least three percent of passengers and crew show symptoms, its vessel sanitation program ...

During the week of Dec. 5, the CDC reported 91 cases of norovirus, more commonly known as the stomach flu, which is over double the highest number recorded between 2021 and 2024.

CDC Reports Rise in Norovirus Cases. The CDC has reported 91 outbreaks during the week of December 5, up from an average of 65 during the same period from 2012 to 2020.

With the decrease of GII.4 outbreaks since 2024, whether GII.17 viruses will continue to cause an earlier onset of the norovirus season cannot yet be determined," the CDC researchers wrote.

Norovirus, often coined the "cruise ship virus," causes more than 90% of diarrheal disease outbreaks on cruise ships, according to the CDC. Still, norovirus outbreaks on cruise ships account for ...

The CDC notes that norovirus can found in both vomit and feces "even before you start feeling sick." "The virus can also stay in your poop for 2 weeks or more after you feel better.

Norovirus outbreaks on cruise ships are spiking in 2025, with 16 reported incidents so far, ... according to CDC records. Norovirus was also the cause in many of those cases.

So far this year, there have been 16 illness outbreaks reported on cruise ships in the CDC's jurisdiction, mostly from norovirus, compared with 18 outbreaks in all of 2024 and 14 in 2023, VSP ...

Travellers planning to set sail this season can rest a little easier—cruise ships aren't the norovirus breeding grounds ...

(WFRV) – Officials with the CDC released norovirus data that showed there were more reported outbreaks in 2024 compared to the same time period in 2023. Centers for Disease Control and ...

A CDC spokesperson said the agency is monitoring norovirus outbreaks through its CaliciNet laboratory database and pointed to a surge of GII.17 strains in Asia and Europe in 2014 that was followed ...