A man dressed as Santa Claus gestures as people walk past, in London, Saturday, December 4, 2021. Britain says it will offer all adults a booster dose of vaccine within two months to bolster the nation's immunity as the new omicron variant of the coronavirus spreads. New measures to combat variant came into force in England on Tuesday, with face coverings again compulsory in shops and on public transport. (Photo by Alberto Pezzali/AP Photo)
