US President Joe Biden tested positive for the coronavirus on Saturday, just days after being given a clean bill of health following a coronavirus infection earlier this month. Biden’s physician, Kevin O’Connor, said in a statement that rebound infections are not unheard of in patients like Biden, who were treated with Paxlovid, an antiviral medication. Biden has returned to “strict isolation procedures,” to be on the safe side. “The president has experienced no reemergence of symptoms, and continues to feel quite well. This being the case, there is no reason to reinitiate treatment at this ti…