The governor's announcement came 10 days after he announced he had received his second Moderna booster at a clinic in Bakersfield.

The new order is made in light of the emergence in Santa Clara County of the Omicron variant of SARS-CoV-2, the virus that causes COVID-19 and the 'imminent threat' that it poses to the health of vulnerable residents and the capacity of the healthcare system.

Mayor Sam Liccardo's proposed mandate would make San Jose the first city in California to require booster shots.

To be fully up to date with COVID vaccine protection, people need to have a booster shot, said County Health Officer Dr. Sara Cody.