90 year old Margaret Keenan, the first patient in the UK to receive the Pfizer-BioNTech COVID-19 vaccine, administered by nurse May Parsons 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)