U.S. officials on Tuesday unveiled plans to begin vaccinating millions of Americans against COVID-19 as early as mid-December, as coronavirus infections and hospitalizations in the US soared once more to unprecedented heights. … [the chief adviser of] Operation Warp Speed program said on Tuesday that 20 million people could be inoculated by the end of 2020, and that by the middle of 2021 most Americans will have access to highly effective vaccines. “Within 24 hours, maybe at most 36 to 48 hours, from the approval, the vaccine can be in people’s arms,” Moncef Slaoui, a former GlaxoSmithKline executive, said...