Pfizer and BioNTech Seek US Authorization for 4th COVID-19 Vaccine Dose for Ages 65 and Over

A person receives a bandage after their first dose of the Pfizer COVID-19 vaccine at a clinic in Los Angeles on Aug. 7, 2021. Patrick T. Fallon/AFP via Getty Images

Pfizer and its German partner BioNTech on Tuesday requested emergency use authorization (EUA) from the U.S. Food and Drug Administration (FDA) for a second COVID-19 booster dose for seniors.

This would be the fourth dose to the regimen of the Pfizer-BioNTech (Pfizer) COVID-19 vaccines for those aged 65 and over.