US President Joe Biden tested positive for Covid-19 again on Saturday morning without showing symptoms, and will return to isolation to "protect" those around him, his personal doctor announced in a letter released by the White House.

The 79-year-old president “tested positive late Saturday morning in an antigen test” and “will be resuming strict containment measures,” Dr. Kevin O’Connor wrote, noting that cases of "Rebound" of positivity are common among people treated with Paxlovid, Pfizer's anti-Covid pill.

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Covid-19 in the United States: Joe Biden's state of health "has improved" since his positive test

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Coronavirus: Recovered from Covid, Joe Biden back in the Oval Office

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