Oil rebounded as a new virus treatment showed promising results, but rising Covid-19 cases continued to weigh on the market. Oil gained 2.4% in New York on Friday but is still down for the week. The market followed stocks higher after Gilead Sciences Inc said its remdesivir treatment cut Covid-19 mortality risk by 62%. Still, the coronavirus pandemic is far from easing around the world and the International Energy Agency said a jump in cases could derail the market recovery. Crude has stru ....