The Food and Drug Administration on Tuesday authorized a second booster of Pfizer-BioNTech and Moderna for adults 50 years and older, announcing that a fourth shot improves protection against severe Covid-19.
The agency also authorized a second Pfizer-BioNTech booster for immunocompromised children older than 12 and a second Moderna booster for immunocompromised adults over 18 years old.
“Current evidence suggests some waning of protection over time against serious outcomes from Covid-19 in older and
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