by Mike Stobbe Comirnaty, a new Pfizer/BioNTech vaccination booster for COVID-19, is displayed at a pharmacy in Orlando, Fla., on Friday, Sept. 15, 2023. Older U.S. adults should roll up their sleeves for another COVID-19 shot, even if they received a booster in the fall, an influential government advisory panel said Wednesday, Feb. 28, 2024....