The Food and Drug Administration has granted emergency use approval for Gaithersburg, Maryland-based Novavax’s updated COVID-19 booster shot, nearly three weeks after approving mRNA vaccine updates from Pfizer and Moderna. The Novavax vaccine still must get approval from the Centers for Disease Control and Prevention before being made publicly available. Both the Pfizer and Moderna vaccines received CDC approval last month and have been publicly available for several weeks.