A Jackson, Miss., resident receives a Pfizer booster shot from a nurse at a vaccination site Tuesday, Feb. 8, 2022. In August 2022, Pfizer and Moderna both asked U.S. regulators to authorize modified versions of their booster vaccine — shots that are half the original recipe and half protection against BA.4 and BA.5, the newest subtypes of the coronavirus omicron variant. (AP Photo/Rogelio V. Solis, File)
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