U.S. FDA authorizes 4th dose of Pfizer COVID-19 shot for Americans 50 and up - CBC News

3/29/2022 12:00:00 AM3 years 1 month ago

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.

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 Tuesd… [+2204 chars]

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