DAVIS, Calif. (KGO) -- California scientists are beginning to test the COVID-19 booster shot.
It's happening at UC Davis Health. The volunteers are the same people who participated in the first Pfizer trials last summer, They'll be receiving the identical vaccine.
One thing scientists will look at is how strong the antibodies are 6-to-8 months after those first shots.
VIDEO: These 5 Bay Area cities may be 'most at risk' for new COVID-19 infections, data shows
"We're actually going to be measuring antibodies to COVID," said Dr. Timohy Albertson of UC Davis Health, "We've got their baseline. We got their baseline when they started naively last July. We've got their response to the therapy."
Researchers believe that over time, a person's immune system forgets the vaccination.
They're hoping to track how much time passes before someone needs another dose.
Having trouble loading the tracker above? Click here to open it in a new window. RELATED STORIES & VIDEOS:
- Map shows which counties can, can't reopen under reopening tiers
- Cheat sheet: What you can and can't do after being fully vaccinated
- How to register for a COVID-19 vaccine in every Bay Area county
- Map shows everywhere you can get a COVID-19 test in the Bay Area
- Interactive map shows what's closed and what's reopening in the San Francisco Bay Area
- Data tracker: Coronavirus cases, deaths, hospitalizations in every Bay Area county
- Third stimulus check calculator: See how much you could get
- COVID-19 Diaries: Personal stories of Bay Area residents during pandemic
- Get the latest updates on California EDD, stimulus checks, unemployment benefits
- Coronavirus origin: Where did COVID-19 come from?
- What is a COVID-19 genetic, antigen and antibody test?
- What does COVID-19 do to your body and why does it spread so easily?
- Coronavirus Timeline: Tracking major moments of COVID-19 pandemic in San Francisco Bay Area
- Coronavirus Doctor's Note: Dr. Alok Patel gives his insight into COVID-19 pandemic
CDC COVID-19 Transmission Levels by U.S. County
Map not displaying correctly? Click here to open in a new window.