With a model of the COVID-19 virus displayed, President Biden listens as Dr. Barney Graham, left, speaks during a visit at the Viral Pathogenesis Laboratory at the National Institutes of Health (NIH), Thursday, Feb. 11, 2021, in Bethesda, Md. Kizzmekia Corbett, an immunologist with the Vaccine Research Center at the NIH, listens at right. (AP Photo/Evan Vucci)
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