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In this Thursday, Feb. 20, 2020, file photo, a view of the AstraZeneca logo, on a building, in South San Francisco, Calif. Drugmaker AstraZeneca secured its first agreements Thursday, May 21, 2020, for 400 million doses of a COVID-19 vaccine, bolstered by an investment from the U.S. vaccine agency. (AP Photo/Jeff Chiu, File)
Photo by: Jeff Chiu
In this Thursday, Feb. 20, 2020, file photo, a view of the AstraZeneca logo, on a building, in South San Francisco, Calif. Drugmaker AstraZeneca secured its first agreements Thursday, May 21, 2020, for 400 million doses of a COVID-19 vaccine, bolstered by an investment from the U.S. vaccine agency. (AP Photo/Jeff Chiu, File)

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