In this Jan. 12, 2021, file photo resident of Harmony Court Assisted Living receives the Pfizer COVID-19 vaccine in Jackson, Miss. With booster doses of Pfizer’s COVID-19 vaccine now authorized in the U.S., government advisers reconvened on Thursday, Sept. 23, to tackle the most contentious question yet: Exactly who should roll up their sleeves right away? (AP Photo/Rogelio V. Solis, File)
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