Biden tests positive for Covid-19 in ‘rebound’ case: Physician

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US President Joe Biden tested positive for Covid-19 in a "rebound" case, days after ending isolation and treatment, according to his doctor.</p>
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White House physician Kevin O'Connor wrote in a memo on Saturday that the President "has experienced no reemergence of symptoms, and continues to feel quite well" but will reinitiate strict isolation procedures.<br />
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"This being the case, there is no reason to reinitiate treatment at this time," he added. "But we will obviously continue close observation."<br />
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Biden, 79, first tested positive for the coronavirus on July 21 before receiving negative testing results earlier this week, Xinhua news agency reported.<br />
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Fully vaccinated and twice boosted, the President took Paxlovid, an antiviral therapy produced by Pfizer and given to patients with Covid-19.<br />
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There is potential for so-called "rebound" Covid positivity observed in a small percentage of patients treated with Paxlovid, according to O'Connor.</p>