U.S. FDA authorizes 4th dose of Pfizer COVID-19 shot for Americans 50 and up March 29, 2022 U.S. regulators have authorized a fourth dose of Pfizer-BioNTech's COVID-19 vaccine for Americans 50 and older because of concerns about waning immunity in the age group, the drugmakers said on Tuesday. Labels: CBC | Health News health Share to: Twitter Facebook URL Print Email
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