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Margaret Keenan, 90, is applauded by staff as she returns to her ward after becoming the first patient in the UK to receive the Pfizer-BioNTech COVID-19 vaccine, at University Hospital, Coventry, England, Tuesday Dec. 8, 2020. The United Kingdom, one of the countries hardest hit by the coronavirus, is beginning its vaccination campaign, a key step toward eventually ending the pandemic. (Jacob King/Pool via AP)