FILE - In this Tuesday, March 3, 2020 file photo, Dr. Kizzmekia Corbett, left, senior research fellow and scientific lead for coronavirus vaccines and immunopathogenesis team in the Viral Pathogenesis Laboratory, talks with President Donald Trump as he tours the Viral Pathogenesis Laboratory at the National Institutes of Health in Bethesda, Md. Dozens of research groups around the world are racing to create a vaccine as COVID-19 cases continue to grow. (AP Photo/Evan Vucci)
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