FDA, CDC authorize second Covid-19 booster dose for people 50 and above

U.S. health officials on Tuesday give the nod to second Covid-19 booster dose for adults age 50 and older, pointing to data showing waning immunity against the virus.

The U.S. Food and Drug Administration authorized Pfizer (NYSE: PFE) and Moderna (NYSE: MRNA)second Covid-19 booster doses or fourth vaccine doses and said the doses are to be administered at least four months after the previous dose.

The agency also authorized a fifth dose of Pfizer for people age 12 and older with weakened immune systems and those 18 and older with the same condition are eligible for Moderna.

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