In this photo illustration, a silhouette of hands in medical gloves holds a medical syringe and a vial in front of the Pfizer logo of a US pharmaceutical industry company. (Photo Illustration by Pavlo Gonchar/SOPA Images/LightRocket via Getty Images) PHILADELPHIA - Just one day after Pfizer received authorization to begin vaccinating children ages 12 to 15, Montgomery and Bucks counties began administering doses.