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National News

Here’s Why Vaccinated People Still Need to Wear a Mask

Discarded bottles of the Pfizer-BioNTech COVID-19 vaccine in Cardiff, Wales, on Tuesday, Dec. 8, 2020. Great Britain’s National Health Service delivered its first shots of the vaccine on Tuesday, opening a mass vaccination campaign with little precedent in modern medicine and making Britons the first people in the world to receive a clinically authorized, fully tested vaccine. (Andrew Testa/The New York Times)