On April 1, Pfizer-BioNTech released results from the longest study yet of their COVID-19 vaccine.
In a release, the companies reported that their two-dose vaccine was 91.3% efficacious in protecting people from COVID-19 disease for up to six months. The companies’ previous data, which led to the U.S. Food and Drug Administration’s (FDA) emergency use authorization, included an average of two months of follow up of the study participants and showed 95% efficacy against the disease.
