The FDA has approved a second booster of the Pfizer-BioNTech COVID-19 vaccine.
The FDA has approved a second booster of the Pfizer-BioNTech COVID-19 vaccine.
Due to concerns about diminishing immunity in this age range, US regulators approved a second booster dosage of the Pfizer-BioNTech COVID-19 vaccine for persons aged 50 and older, the drugmakers announced on Tuesday (Mar 29).