In this March 2021 photo provided by Pfizer, vials of the Pfizer-BioNTech COVID-19 vaccine are prepared for packaging at the company’s facility in Puurs, Belgium. Pfizer is about to seek U.S. authorization for a third dose of its COVID-19 vaccine, saying Thursday, July 8, 2021, that another shot within 12 months could dramatically boost immunity and maybe help ward off the latest worrisome coronavirus mutant. (Pfizer via AP)

July 8, 2021