WASHINGTON 鈥 US President Joseph R. Biden tested positive for coronavirus disease 2019 (COVID-19) again on Saturday in what the White House doctor described as a 鈥渞ebound鈥 case seen in a small percentage of patients who take the antiviral drug Paxlovid.
Mr. Biden, 79, who emerged from COVID isolation on Wednesday after testing positive on July 21, said he was feeling fine.
He will now return to strict isolation and will cancel planned trips to his home in Wilmington and work trip in Michigan, the White House said. Mr. Biden held public events on Wednesday and Thursday, but none on Friday.
The forced isolation comes as the White House was hoping to celebrate some recent legislative victories to help boost Mr. Biden鈥檚 slumping poll ratings.
Mr. Biden had planned the Michigan trip to tout Thursday鈥檚 passage of legislation to boost the US semiconductor chips industry.
Mr. Biden鈥檚 positive test is believed to be a 鈥渞ebound鈥 experienced by some COVID patients who take the anti-viral drug Paxlovid, according to White House physician Dr. Kevin O鈥機onnor. Paxlovid is an antiviral medication from Pfizer. Inc. PFE.N that is used to treat high-risk patients, such as older patients.
A small but significant percentage of people who take Paxlovid will suffer a relapse or a rebound that occurs days after the five-day treatment course has ended, studies have shown.
White House officials had previously suggested a rebound case of COVID was unlikely, based on reports of cases around the country. However, Mr. Biden continued to be tested and monitored.
Mr. Biden tweeted about his positive case, saying it can happen to a 鈥渟mall minority of folks.鈥 He later posted a video on Twitter where he said he was 鈥渇eeling fine鈥 and 鈥渆verything鈥檚 good.鈥
A White House official said contact tracing efforts were underway Saturday after Biden鈥檚 positive COVID-19 test.
National Institute of Allergy and Infectious Diseases Director Dr. Anthony Fauci also experienced rebound COVID-19. His symptoms got worse when they returned after treatment, and his doctors prescribed another course of Paxlovid.
Mr. O鈥機onnor said Mr. Biden tested negative for the last four days, and there is no plan to reinitiate treatment given his lack of symptoms. 鈥 Reuters
