The Governor of California, who met with Prime Jacinda Ardern in San Francisco yesterday, has tested positive for Covid-19.

California Governor Gavin Newsom, with Jacinda Ardern, at a media conference yesterday. Photo: Josh Edelson

The pair met for a joint media conference, held outdoors at the Botanical Garden, to announce a new partnership between the state and New Zealand, on climate change.

Governor Gavin Newsom tweeted about his positive result Saturday afternoon (US time).

"This AM, I tested positive for Covid-19 and am currently experiencing mild symptoms. Grateful to be vaccinated & for treatments like Paxlovid," he said.

Newsom said he was following health directives and would be working remotely while he isolates.

Ardern tested positive for Covid-19 about 10 days before she left for the trip and has since been cleared for travel and a visit to the White House.