In the U.S., meanwhile, government officials reported that vaccinations have accelerated markedly after a sluggish start. Dr. Anthony Fauci, the nation's top infectious-disease expert, said over the weekend that 1.5 million shots were administered in 72 hours, bringing the total over the past three weeks to about 4 million.
Britain on Monday became the first nation to start using the COVID-19 vaccine developed by AstraZeneca and Oxford University, ramping up its nationwide inoculation campaign amid soaring infection rates blamed on a new and seemingly more contagious variant of the virus.
Brian Pinker, an 82-year-old dialysis patient, received the first shot at Oxford University Hospital, saying in a statement: "I can now really look forward to celebrating my 48th wedding anniversary."
Britain's vaccination program began Dec. 8 with the shot developed by Pfizer and its German partner BioNTech.
The country has recorded more than 50,000 new coronavirus infections a day over the past six days, and deaths have climbed past 75,000, one of the worst tolls in Europe.
Prime Minister Boris Johnson announced a wave of near-lockdowns the weekend before Christmas and warned on Monday that "tough, tough" weeks lie ahead and that tighter restrictions are coming soon: "If you look at the numbers, there's no question we will have to take tougher measures."