Rochelle Walensky, who has been nominated to serve as director of the Centers for Disease Control and Prevention, speaks after US President-elect Joe Biden announced his team tasked with dealing with the Covid-19 pandemic at The Queen in Wilmington, Delaware on December 8, 2020. – President-elect Joe Biden on December 7, 2020 named the team tasked with turning around the United States’ floundering efforts to quell the Covid-19 pandemic, nominating Xavier Becerra as his secretary of health. Biden warned Congress must act or risk vaccine drive will ‘slow or stall’. (Photo by Jim WATSON / AFP) (Photo by JIM WATSON/AFP via Getty Images)

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