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Medical staff prepare the vaccine against the coronavirus at the Arena Treptow vaccine center during the start of the vaccination against COVID-19 in Berlin, Germany, Sunday, Dec. 27, 2020. The first shipments of coronavirus vaccines developed by BioNTech and Pfizer have arrived across the European Union, authorities started to vaccinate the most vulnerable people in a coordinated effort on Sunday. (AP Photo/Markus Schreiber, Pool)