California Gov. Gavin Newsom tested positive for a breakthrough case of COVID-19 on Saturday morning after experiencing mild symptoms, according to a statement from his office.

The statement added that Newsom is taking the antiviral pill Paxlovid and that he is currently in isolation, where he will continue work remotely. Newsom will isolate until he tests negative for COVID-19, and at least through Thursday.

Newsom is fully vaccinated and received a second COVID-19 booster vaccine May 18, according to the statement.