On November 17, 2021, the U.S. Centers for Disease Control and Prevention (CDC) issued Emergency Use Instructions (EUI) and updated its clinical considerations to allow the COVID-19 vaccine by Pfizer-BioNTech to be given as an additional primary dose or booster dose to certain people who completed a vaccine primary series with certain COVID-19 vaccines that are not authorized or approved by the U.S. Food and Drug Administration. This ensures that eligible people who were vaccinated outside of th…

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