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. (AP Photo/John Locher, File)
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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. (AP Photo/John Locher, File)
