This May 4, 2020, file photo provided by the University of Maryland School of Medicine, shows the first patient enrolled in Pfizer's COVID-19 coronavirus vaccine clinical trial at the University of Maryland School of Medicine in Baltimore. Pfizer and BioNTech say they've won permission Wednesday, Dec. 2, 2020, for emergency use of their COVID-19 vaccine in Britain, the world’s first coronavirus shot that’s backed by rigorous science -- and a major step toward eventually ending the pandemic. (Courtesy of University of Maryland School of Medicine via AP, File)
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