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A health worker administers a dose of a Pfizer COVID-19 vaccine during a vaccination clinic in Reading, Pa., Sept. 14, 2021. Pfizer asked U.S. regulators Monday, Aug. 22, 2022, to authorize its combination COVID-19 vaccine that adds protection against the newest omicron mutants — a key step toward opening a fall booster campaign. (AP Photo/Matt Rourke, File)

A health worker administers a dose of a Pfizer COVID-19 vaccine during a vaccination clinic in Reading, Pa., Sept. 14, 2021. Pfizer asked U.S. regulators Monday, Aug. 22, 2022, to authorize its combination COVID-19 vaccine that adds protection against the newest omicron mutants — a key step toward opening a fall booster campaign. (AP Photo/Matt Rourke, File)

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