COVID-19 vaccine must protect 50% of people for approval, FDA says

Any experimental COVID-19 vaccines aspiring to earn regulatory approval from the Food and Drug Administration will need to prevent or decrease the severity of disease in at least 50 percent of people, the agency announced Tuesday.

The criterium is part of a larger set of guidelines released by the agency for developing a vaccine to halt the spread of pandemic coronavirus, SARS-CoV-2—which causes COVID-19 and is now accelerating in much of the country after months of sustained devastation.

With the guidelines, the FDA tried to dispel fears that the rush to develop a COVID-19 vaccine may come at the expense of adequate safety testing. “We recognize the urgent need to develop a safe and effective vaccine to prevent COVID-19,” FDA Commissioner Stephen Hahn said in a statement. “While the FDA is committed to expediting this work, we will not cut corners in our decisions and are making clear through this guidance what data should be submitted to meet our regulatory standards.”