People line up outside a walk-in Covid-19 vaccination centre at St Thomas's Hospital in London, with Big Ben in the background, on Monday, Dec. 13. The United Kingdom began offering all adults booster shots after Prime Minister Boris Johnson said the country faces a "tidal wave" of omicron cases. Johnson on Monday reported the country's first COVID-19 death involving the new variant. Monday also marks the one year anniversary of the first shipments of COVID-19 vaccine rolling out of Pfizer's production facilities and heading toward hospitals to launch U.S. vaccination efforts. Tap the link in bio to read more. 📸 Rob Pinney, @gettyimages; Matt Dunham, @apnews #coronavirus #vaccines #boostershot