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The FDA authorizes COVID booster shots for all U.S. adults

A health care worker administers a third dose of the Pfizer-BioNTech COVID-19 vaccine at a senior living facility in Worcester, Pa., in August. (Bloomberg via Getty Images)
A health care worker administers a third dose of the Pfizer-BioNTech COVID-19 vaccine at a senior living facility in Worcester, Pa., in August. (Bloomberg via Getty Images)

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