Biden, 79, has received a total of four vaccine doses, including two booster shots, according to a brief statement by White House press secretary Karine Jean-Pierre in confirming the positive test.
"This morning, President Biden tested positive for COVID-19. He is fully vaccinated and twice boosted and experiencing very mild symptoms," she said.
"He has begun taking Paxlovid," the press secretary added, referring to the Pfizer antiviral drug designed to reduce the severity of the disease.
This is the first time Biden has contracted the virus. Because of the president's advanced age, he is considered to be in the at-risk group in terms of developing severe COVID-19.
"Consistent with [Centers for Disease Control] guidelines, he will isolate at the White House and will continue to carry out all of his duties fully during that time," she said. "He has been in contact with members of the White House staff by phone this morning, and will participate in his planned meetings at the White House this morning via phone and Zoom from the residence."
"Out of an abundance of transparency, the White House will provide a daily update on the president’s status as he continues to carry out the full duties of the office while in isolation," Jean-Pierre said.
More DetailsThe positive test comes a day after Biden visited Somerset, Massachusetts, and said he would take executive steps related to the climate, including funding for offshore wind farms in the Gulf of Mexico. There was speculation that he would declare a climate-related emergency, but it did not materialize on July 20.
Biden flew to the Massachusetts town on Air Force One.
“After I finished the five days of Paxlovid, I reverted to negative on an antigen test for three days in a row,” Fauci revealed in late June. “And then on the fourth day, just to be absolutely certain, I tested myself again. I reverted back to positive.”