That's why California is recommending booster shots for everyone 18 and older.
It's a position that the CDC and FDA do not officially endorse at this time but are widely expected to change in the coming days.
For those who got the J&J vaccine, the CDC recommends adults get a booster two months after their first shot.
RELATED: California's top health official says if you want a COVID booster shot, 'absolutely' get one
"The same way we look at influenza vaccines, which basically we need annual boosters for," says Dr. Kenny Banh with UCSF Fresno.
On Tuesday, Governor Gavin Newsom visited Kings County, one of the least-vaccinated areas of the state warning cases could spike again this winter.
"We still have a large portion of the population that has not yet gotten vaccinated," he said.
For weeks, booster shots were reserved only for people over 65 and adults at high risk of COVID-19 due to health conditions or work.
But California's MyTurn website now lets people 18 and older book a booster or find a walk-in location.
We headed to the UCSF Fresno mobile heal drive-thru clinic to see what the process is like.
Be prepared to show staff members your vaccine card and ID, Then continue in line to the next tent.
When you reach this point, a vaccine support specialist verifies your age and which vaccine you received.
Jim and Donna Bryson stopped by the Fresno clinic to get their COVID boosters.
VIDEO: 'It's unacceptable': Several CA children sick after getting receiving wrong dose of COVID vaccine
Several Bay Area kids sick, received wrong dose of COVID vaccine
"Things aren't like they were before. We want to be safe."
Boosters add another layer of protection and health experts say that should give you extra peace of mind about celebrating the holidays with others.
But there are still precautions experts suggest you take.
"We ask that again when you are with your family members that you still just, you know, kind of stick by what we've said before," says Tulare County Public Health Director Karen Elliot.
Having trouble loading the tracker above? Click here to open it in a new window.