This undated electron microscope image made available by the U.S. National Institutes of Health in February 2020 shows the novel coronavirus, SARS-CoV-2, the virus that causes COVID-19. (NIAID-RML via AP) ** FILE **
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This undated electron microscope image made available by the U.S. National Institutes of Health in February 2020 shows the novel coronavirus, SARS-CoV-2, the virus that causes COVID-19. (NIAID-RML via AP) ** FILE **
