Washington DC - President Joe Biden tested negative for Covid-19, his physician announced Saturday.

The 79-year-old, who was first diagnosed with coronavirus last month, will continue to isolate until he tests negative a second time.

"The president continues to feel very well," Dr Kevin O’Connor said in a statement released through the White House. "Given his rebound positivity which we reported last Saturday, we have continued daily monitoring. This morning, his SARS-CoV-2 antigen testing was negative."

Biden, who is fully vaccinated and double-boosted, first tested positive for the virus on July 21. He was given Paxlovid to treat the illness and went into isolation. He then tested negative, but on July 30 tested positive again.

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Such "rebound" cases are common with people who receive Paxlovid.

The president, who was infected with by the BA.5 subvariant, experienced a cough and other mild symptoms, but has been able to work while in isolation.

It's not just Biden's Covid infection that rebounded. This period of isolation turned out to be hugely productive for the commander-in-chief's agenda as he announced the killing of Al-Qaeda leader Ayman al-Zawahiri, signed an executive order on abortion rights, and negotiated key legislation in the space of just two weeks.

Biden can "safely return to public engagement and president travel" after returning a second negative Covid-19 test this morning, White House doctor Kevin O’Connor said in a statement.

With the "strict isolation" now over, he's set to visit Kentucky on Monday to meet Governor Andy Beshear, a fellow Democrat, and families impacted by recent deadly flooding there.