A syringe is prepared with the Pfizer COVID-19 vaccine at a clinic at the Reading Area Community College in Reading, Pa., on Sept. 14, 2021. U.S. regulators have opened up COVID-19 booster shots to all and more adults, Friday, Nov. 19, letting them choose another dose of either the Pfizer or Moderna vaccine. (AP Photo/Matt Rourke, File)
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