Pfizer’s vaccine is currently cleared under a so-called emergency use authorization, which allows the company to sell the vaccine for as long as Covid-19 is considered a public health emergency. But with Covid-19 still raging, and its spread now fueled by the Delta variant, lawmakers and prominent health experts have urged the FDA to expedite full approval of Pfizer’s vaccine, saying it would be a powerful tool in convincing the unvaccinated to get their shots and in giving businesses and other entities a stronger legal foundation to impose vaccine mandates.