“The President continues to do very well,” wrote Dr. Kevin O’Connor. “Given his rebound positivity, as we reported on Saturday, we have continued daily monitoring. This morning, his SARS-CoV-2 antigen test was negative. In an abundance of caution, the President will continue his strict isolation measures pending another negative test as previously described.”
According to the US Centers for Disease Control and Prevention, “People with recurrence of COVID-19 symptoms or a new positive viral test after testing negative should restart isolation and isolate again for at least 5 days.”
The CDC issued a health alert to doctors on May 24 advising that Covid-19 symptoms sometimes come back, and this may just be how the infection plays out in some people, regardless of whether they are vaccinated or treated with drugs such as Paxlovid. The CDC said most rebound cases involve mild illness and there have been no reports of severe illness.
Biden is fully vaccinated and received two booster shots. He received his first two doses of the Pfizer/BioNTech Covid-19 vaccine prior to his inauguration in January 2021, his first booster shot in September and his second booster vaccination in March.
This story has been updated.