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FILE - In this Jan. 22, 2021, file photo, a certified medical assistant prepares doses of the Pfizer COVID-19 vaccine at a vaccination center at the University of Nevada, Las Vegas. With more than 40 million doses of coronavirus vaccines available, U.S. health authorities said they're confident both seniors and other vulnerable Americans seeking booster shots and parents anticipating approval of initial shots for young children will have easy access. (AP Photo/John Locher, File)

FILE - In this Jan. 22, 2021, file photo, a certified medical assistant prepares doses of the Pfizer COVID-19 vaccine at a vaccination center at the University of Nevada, Las Vegas. With more than 40 million doses of coronavirus vaccines available, U.S. health authorities said they're confident both seniors and other vulnerable Americans seeking booster shots and parents anticipating approval of initial shots for young children will have easy access. (AP Photo/John Locher, File)

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