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FILE - In this March 2021 photo provided by Pfizer, a technician works on a line for packaging preparation for the Pfizer-BioNTech COVID-19 vaccine at the company's facility in Puurs, Belgium. Billions more in profits are at stake for some vaccine makers as the U.S. moves toward dispensing COVID-19 booster shots to shore up Americans' protection against the virus. (Pfizer via AP)

FILE - In this March 2021 photo provided by Pfizer, a technician works on a line for packaging preparation for the Pfizer-BioNTech COVID-19 vaccine at the company's facility in Puurs, Belgium. Billions more in profits are at stake for some vaccine makers as the U.S. moves toward dispensing COVID-19 booster shots to shore up Americans' protection against the virus. (Pfizer via AP)

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