The Science Behind The Historic mRNA Vaccine
b'Millions of doses of the Pfizer-BioNTech vaccine, just days ago granted emergency use authorization by the FDA, are being distributed across the country. It\'s the first widely-available vaccine to use something called mRNA technology. So, with the help of epidemiologist Rene Najera, Maddie explains the science behind this vaccine and how it was developed so quickly.
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