The boosters are designed to target hyper-infectious strains of the omicron variant that caused cases to surge over the summer.
[Ads /]
The Pfizer booster is cleared for anyone over 12, and Moderna's booster is for anyone over 18-years-old and two months out from their last shot.
The boosters will target the highly-contagious BA.4 and BA.5 omicron subvariants recently getting the final green light from the Centers for Disease Control and the Food and Drug Administration.
RELATED: COVID-19 News: Americans may need yearly shots to protect against coronavirus
But people who recently had a breakthrough COVID-19 infection are being asked to delay getting the booster by three months after testing positive.
The massive nationwide rollout happening now comes as an average 400 Americans still die everyday from COVID-19.
"As of this past Friday, they started arriving. And by the end of this week, over 90% of Americans will live within five miles of these new updated vaccines," said Xavier Becerra, United States Secretary of Health and Human Services.
RELATED: US ending free at-home COVID-19 test program, citing lack of funding
The clinics listed below are in Concord, Antioch and Richmond.
[Ads /]
Concord - Monument
1034 Oak Grove Rd.
Concord, CA
Hours:
Tues: 12 p.m. - 3:30 p.m. and 4:30 p.m. - 7 p.m.
Wed - Sat: 8 a.m. - 12:00 p.m. and 12:30 p.m. - 3 p.m.
Nick Rodriguez Community Center
[Ads /]
213 F St.
Antioch, CA
Hours:
Tue - Sat: 8 a.m. - 11:30 a.m. and 12:30 p.m. - 3 p.m.
Richmond Auditorium*
403 Civic Center Plaza
Richmond, CA
Hours:
Tues - Sat, 8 a.m. - 11:30 a.m. and 12:30 p.m. - 3 p.m.
*Closed Friday, Sept. 9
County health officials say people could schedule an appointment at the county-run site online or by calling 1-833-829-2626. Walk-ins without appointments are also available as capacity allows, the county said.
You can find out more information about the county clinics here.
People are also encouraged to check for boosters with regular health care providers and pharmacies.
If you're on the ABC7 News app, click here to watch live