President Joe Biden tested negative for COVID-19 on Saturday but will continue to isolate at the White House until a second negative test, his doctor said.

Dr. Kevin O’Connor wrote in his latest daily update that the president, “in an abundance of caution,” will abide by the “strict isolation measures” in place since his “rebound” infection was detected July 30, pending a follow-up negative result.

Biden, 79, came down with the virus a second time three days after he had emerged from isolation from his initial bout with COVID-19, reported on July 21.

There have been rare rebound cases documented among a small minority of those, who like Biden, were prescribed the anti-viral medication Paxlovid, which has been proved to reduce the risk of serious illness and death from the virus among those at highest risk.

O’Connor wrote that Biden “continues to feel very well.”

Biden’s travel has been on hold as he awaited a negative test. He plans to visit Kentucky on Monday to view damage from catastrophic flooding and meet with families.

Biden was “doing great,” White House press secretary Karine Jean-Pierre said Saturday when asked about his health during her appearance in Las Vegas at a joint conference of the National Association of Black Journalists and the National Association of Hispanic Journalists. She said that when she speaks to the president, he tells her to “tell folks I’ve been working eight-plus hours a day.”

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