September 14, 2021
In this Aug. 26, 2021 photo, Parsia Jahanbani prepares a syringe with the Pfizer COVID-19 vaccine in a mobile vaccine clinic operated by Families Together of Orange County in Santa Ana, Calif. An international group of scientists is arguing the average person doesn’t need a COVID-19 booster yet — an opinion that highlights the intense scientific divide over the question. (Jae C. Hong/AP, File)