Pfizer Inc. and BioNTech SE announced the US Food and Drug Administration (FDA) expanded emergency use authorization (EUA) to include a booster dose after completion of the primary series of the Pfizer-BioNTech Covid-19 vaccine in children 5 through 11 years of age. The booster dose is given at least five months after the second dose of the two-dose primary series and is the same 10-
