This file photo of vial and syringes shows the AstraZeneca COVID-19 vaccine, on March 22, 2021. Data from a U.S. study on its vaccine shows it is 79% effective. (AP Photo/Alberto Pezzali, File)
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This file photo of vial and syringes shows the AstraZeneca COVID-19 vaccine, on March 22, 2021. Data from a U.S. study on its vaccine shows it is 79% effective. (AP Photo/Alberto Pezzali, File)
