WATCH: Gov. Newsom gets his COVID-19 booster shot

California Gov. Gavin Newsom is among a growing population of Americans to receive their COVID-19 booster shot.

The governor got his on Wednesday at an event in Alameda County promoting increased vaccination rates and booster shots. Newsom initially got the single-dose Johnson & Johnson vaccine in April – part of a coordinated effort to encourage underserved and underrepresented communities to get the one-and-done vaccine at that time.

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His booster shot – given to the governor by California Health and Human Services Secretary Dr. Mark Ghaly – was Moderna, amplifying a national conversation moving toward a "mix and match" approach utilizing a combination of the Johnson & Johnson, Moderna and Pfizer-BioNTech vaccines to aid immunity.

"That's better than the flu shot," Newsom laughed as he got the dose.

Gov. Gavin Newsom gets his COVID-19 booster shot at an event in Alameda County.
Gov. Gavin Newsom gets his COVID-19 booster shot at an event in Alameda County. Photo credit Matt Bigler/KCBS Radio

The governor said he got his seasonal flu shot last week.

New York Gov. Kathy Hochul, who also got the Johnson & Johnson dose earlier this year, received her Moderna booster shot on Monday.

The U.S. Centers for Disease Control and Prevention has recommended COVID-19 booster shots for certain populations who have gotten the Pfizer or Moderna vaccines six months or more after the initial doses. For the almost 15 million people who got the Johnson & Johnson vaccine, booster shots have been recommended for those who are 18 and older and who were vaccinated two or more months ago.

Oakland Mayor Libby Schaaf also got her COVID-19 booster shot at the event.