The Omicron coronavirus subvariant JN.1 now makes up 44.2% of COVID cases in the United States, according to the CDC.
Contra Costa County is opening up COVID-19 clinics to give out the latest round of omicron booster shots. Find out where here:
The hope is that the modified boosters will blunt yet another winter surge.
"I'm worried that a lot of transmission is occurring," UCSF's Dr. Peter Chin-Hong said. "Not because people are being devious or irresponsible, it's just that they don't know they're positive."
With the BA.5 variant running wild in California, it seems like nearly everyone has had a brush with COVID. But there are exceptions- people who have never ever gotten COVID despite some close calls.
Second booster shots for people under 50 are on hold as federal government works on reformulating vaccines that target the now-dominant omicron subvariants, according to experts.