California Gov. Gavin Newsom has tested positive for COVID-19, his office said Saturday.

The California Democrat's press office said in a release that the governor tested positive on Saturday morning, one day after a visit from New Zealand Prime Minister Jacinda Ardern to San Francisco, where the two leaders held an event announcing a climate change partnership. The governor's office said it had notified the prime minister's delegation of the positive test.

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Newsom's office said the 54-year-old governor is "exhibiting mild symptoms" and will undergo a five-day regimen of the Paxlovid antiviral, which is produced by Pfizer. The governor is fully vaccinated and twice boosted, most recently on May 18 of this year.

"As outlined in California’s SMARTER Plan, which focuses on testing and treatment, the Governor will test prior to leaving isolation," Newsom's office said, adding that "vaccinations and boosters remain the best way to protect yourself from COVID-19."

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In the meantime, the press release continued, the governor will work from home.

In a tweet, Newsom wrote that he was "grateful to be vaccinated and for treatments like Paxlovid."