U.S. President Joe Biden tested positive again for COVID-19 in a so-called "rebound” case seen in people who take the antiviral drug Paxlovid.

Biden, 79, isn’t experiencing symptoms after getting a positive rapid test on Saturday morning, but will resume isolation at the White House, his physician Kevin O’Connor said in a letter released by the White House.

The test once again disrupted Biden’s schedule after he resumed in-person events this week. Trips on Sunday to his hometown of Wilmington, Delaware, and on Tuesday to Michigan to celebrate the passage of a bill to subsidize U.S. semiconductor production were canceled, according to the White House.