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What is an mRNA vaccine and how does it work

The first two COVID-19 vaccines authorized by the Food and Drug Administration (FDA)—the Pfizer-BioNTech (Comirnaty) and Moderna vaccine—are both mRNA COVID-19 vaccines. Learn more about what they are and why they’re safe from infectious disease specialist and vaccine expert Pat Winokur, MD, in our newest Vaxx Facts video.