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FILE - In this Wednesday, March 24, 2021, file photo, a health worker holds a dose of the AstraZeneca COVID-19 vaccine, during a mass vaccination campaign at San Pedro Hospital, in Logrono, northern Spain. AstraZeneca says that its COVID-19 vaccine is strongly effective even after counting additional illnesses in its U.S. study. The announcement late Wednesday was the latest in an extraordinary public dispute with American officials. (AP Photo/Alvaro Barrientos, File)

FILE - In this Wednesday, March 24, 2021, file photo, a health worker holds a dose of the AstraZeneca COVID-19 vaccine, during a mass vaccination campaign at San Pedro Hospital, in Logrono, northern Spain. AstraZeneca says that its COVID-19 vaccine is strongly effective even after counting additional illnesses in its U.S. study. The announcement late Wednesday was the latest in an extraordinary public dispute with American officials. (AP Photo/Alvaro Barrientos, File)

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