Two shipping containers holding the first doses of the Pfizer and BioNTech COVID-19 vaccine arrived at the UPS Worldport in Louisville, Ky., on Sunday.

LOUISVILLE, KY – DECEMBER 13: UPS employees move one of two shipping containers containing the first shipments of the Pfizer and BioNTech COVID-19 vaccine on a ramp at UPS Worldport in Louisville, Kentucky, on Sunday, December 13, 2020. The flight originated in Lansing, Michigan. (Photo by Michael Clevenger – Pool/Getty Images)