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FILE - In this Tuesday, Jan. 12, 2021, file photo, a Walgreens pharmacist prepares a syringe with the Pfizer-BioNTech COVID-19 vaccine for residents and staff at the The Palace assisted living facility in Coral Gables, Fla. Scientists are reporting troubling signs that some recent mutations of the virus that causes COVID-19 may modestly curb the effectiveness of current vaccines but stress that the shots still remain protective. (AP Photo/Lynne Sladky, File)

FILE - In this Tuesday, Jan. 12, 2021, file photo, a Walgreens pharmacist prepares a syringe with the Pfizer-BioNTech COVID-19 vaccine for residents and staff at the The Palace assisted living facility in Coral Gables, Fla. Scientists are reporting troubling signs that some recent mutations of the virus that causes COVID-19 may modestly curb the effectiveness of current vaccines but stress that the shots still remain protective. (AP Photo/Lynne Sladky, File)

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