After three years of worrying about respiratory viruses such as COVID and RSV, an old bug is making a new surge.
Norovirus cases are surging at a time of year when they’re usually tapering off. According to the Centers for Disease Control and Prevention, positive norovirus tests on average exceeded 15% over a three-week period that ended last week.
The virus, which causes vomiting and diarrhea, is most serious in young children, the elderly and people with compromised immunity. And it’s contagious.
Dr. Peter Chin Hong, infectious disease specialist with UCSF, says the virus spreads rather easily.
“Whenever you get crowded and you didn’t get something for a few