Washington (AFP) – US President Joe Biden ended his Covid isolation Wednesday, telling cheering aides that his quick recovery from infection should inspire Americans to take advantage of free vaccines and treatments. “I thought I heard a rumbling in my staff saying, ‘He’s back,'” Biden joked to a crowd of staff in the Rose Garden after he emerged from the White House residence for the first time since ending a five-day isolation period. “Thanks for sticking around.” Wearing his beloved Aviator sunglasses under a scorching sun, the 79-year-old Democrat noted the difference when Republican Donal…