FILE - 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’s COVID-19 vaccine is entering the final phase of review by U.S. government regulators. The Food and Drug Administration on Tuesday, Dec. 8 released a positive review of the vaccine. (Courtesy of University of Maryland School of Medicine via AP, File)
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