FDA approves updated Covid-19 vaccines, shots available in daysbr br US regulators approve updated Covid-19 vaccines on Aug. 23, 2024, shots designed to more closely target recent virus strains -- and hopefully whatever variants cause trouble this winter, too. With the Food and Drug Administration’s clearance, Pfizer and Moderna are set to begin shipping millions of doses. A third US manufacturer, Novavax, expects its modified vaccine version to be available a little later.