FDA authorized a single booster dose of the Pfizer-BioNTech COVID-19 vaccine for those aged 65 and older and adults at high risk. Know what is a COVID booster shot?
source https://www.jagranjosh.com/current-affairs/fda-approves-pfizerbiontech-covid19-booster-for-older-and-highrisk-americans-know-details-1632394706-1