The U.S. is seeing a "quad-demic" as cases of COVID-19, flu, RSV and norovirus spread at the same time. Experts said this is what you need to know.

This winter's wave of norovirus infections has reached levels that are now more than double last season's peak, in figures published Monday by the Centers for Disease Control and Prevention tracking the notorious stomach bug.

As illness is spreading around the state, one patient says their senior living facility is keeping residents separated to prevent more people from getting sick.

The cases mark the fourth norovirus outbreak on Holland America ships since early December, following others on its Eurodam, Rotterdam and Zuiderdam vessels. Other companies, including Cunard Line and Princess Cruises also saw outbreaks in recent weeks.

You can also get norovirus by touching objects or surfaces that are contaminated and then putting your hands in your mouth without washing them first. Hand-washing with soap and water is key, as hand sanitizer will not do the trick in the case of norovirus, experts say.

As many people know all too well, norovirus is a wicked illness. It causes gastroenteritis, a fancy name for violent

The brief but miserable symptoms have no treatment except hydration and rest. Doctors have several tips on how to stop the spread.

CHICOPEE, Mass. (WWLP) – A new strain of Norovirus is impacting children and adults, and it’s spreading in our state. Respiratory illnesses continue to surge, that’s because it’s colder and more people are indoors allowing germs to spread, but it can be prevented.

No. Hand sanitizer is simply not as effective against norovirus as it at killing other pathogens due to the virus's firm shell, Dr. William Schaffner, professor of infectious diseases at Vanderbilt University Medical Center, told TODAY.com recently.

According to the Minnesota Department of Health, there have been 76 reported outbreaks in December which is higher than in previous years.

The Pasadena Public Health Department reported Friday there was an outbreak of the gastrointestinal Norovirus at the American Red Cross’ Pasadena Evacuation Shelter for area residents displaced by the Los Angeles wildfires.