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

HEALTH-CORONAVIRUS/AUSTRIA VACCINATION

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.

CBC | World News

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