evidence: Pfizer becomes first Covid vaccine to gain full FDA approval Pfizer's two-dose Covid-19 vaccine has received full approval from the US Food and Drug Administration (FDA) - the first jab to be licensed in the nation. [...] In a statement, the FDA said its review for approval included data from approximately 44,000 people. The vaccine, which will now be marketed as Comirnaty, was found to be 91% effective in preventing Covid disease.