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  2020-12-14

  The U.S. Approves a Vaccine

  The Food and Drug Administration authorized Pfizer’s Covid-19 vaccine for emergency use on Friday, clearing the way for millions of highly vulnerable people to begin receiving inoculations within days. The authorization is a turning point in a pandemic that has taken more than 290,000 lives in the United States. With the decision, the United States becomes the sixth country — in addition to Britain, Bahrain, Canada, Saudi Arabia and Mexico — to clear the vaccine. Today, we ask the science and health reporter Donald G. McNeil Jr. what might happen next.