The FDA has granted full approval to Pfizer Inc.’s COVID-19 vaccine in a move that is hoped will convince unvaccinated citizens that the shot is safe and effective. The mRNA vaccine, which will be branded as Comirnaty and was first developed by Germany’s Biontech SE, has been available since Dec. 11 last year under an emergency use authorization (EUA) and is the first to receive the FDA’s full endorsement.