The Centers for Disease Control and Prevention says there has been a spike in cases of norovirus across the country.

Stamford Health is seeing a spike too.

"Norovirus is a viral infection," said board certified infectious disease specialist at Stamford Health doctor Asha Shah.

Shah says norovirus, commonly called the stomach bug, is very contagious and is typically seen at this time of the year.

"It causes a gastrointestinal illness so basically fever, nausea, vomiting, and diarrhea," said Shah.

Shah says the virus usually lasts for a few days.

"The best treatment is just good old fashioned supportive care so hydration, rest. We do urge people who do have symptoms to stay home because it can be quite infectious," said Shah.

She says norovirus spreads in close contact places like schools and nursing homes.

Shah says the best prevention is something doctors have been preaching about COVID.

"The mainstay of prevention is good old fashioned hand washing so you really want to use that warm water and soap. Wash for 20 seconds. That's what really prevents this from spreading," said Shah.

Doctors say norovirus seems to be even more prevalent in children and older adults.

The CDC says washing fruits and vegetables is another good preventative measure.