What to know about norovirus

Cases of norovirus—a common viral stomach illness—tend to occur in the U.S. between November and April. According to the Centers for Disease Control and Prevention, there have been at least 13 cruise ship outbreaks so far in 2023. But norovirus causes about 20 million cases each year in the U.S. with more than 100,000 hospitalizations, and it can spread almost anywhere, so it’s important to know how to spot it and deal with an infection.