https://www.siliconvalley.com/2021/04/01/bay-area-expands-covid-shots-but-shortages-variants-alarm-experts/

Even with California hitting a major pandemic milestone — opening COVID vaccination appointments to everyone 50 and older — Bay Area health officials painted a sobering picture Thursday as they warned residents about the continued spread of troubling virus variants and vaccine shortages.

Middle-aged Californians newly eligible for shots scrambled for coveted appointments, sometimes getting turned away because of a lack of supply. At the same time, experts warned of an alarming rise in COVID variant infections. It’s a “race between the variants and the vaccine,” said Santa Clara County Health Officer Dr. Sara Cody. But throughout the Bay Area, team vaccine has been handicapped by a dearth of shots.