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The FDA authorized 4th vaccine dose for Americans over 50. What do we know about whether it works?

05:46
    A healthcare worker prepares to administer a Pfizer/BioNTEch coronavirus vaccine (Carlos Osorio/POOL/AFP via Getty Images)
    A healthcare worker prepares to administer a Pfizer/BioNTEch coronavirus vaccine (Carlos Osorio/POOL/AFP via Getty Images)

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