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In this Thursday, Feb. 11, 2021, file photo, President Joe Biden visits the Viral Pathogenesis Laboratory at the National Institutes of Health (NIH) in Bethesda, Md. At bottom center is a model of the COVID-19 virus. (AP Photo/Evan Vucci) ** FILE **
Photo by: Evan Vucci
In this Thursday, Feb. 11, 2021, file photo, President Joe Biden visits the Viral Pathogenesis Laboratory at the National Institutes of Health (NIH) in Bethesda, Md. At bottom center is a model of the COVID-19 virus. (AP Photo/Evan Vucci) ** FILE **

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