Pfizer: Our COVID-19 vaccine prevents 94 percent of asymptomatic infection
The companies also said the latest analysis of the Israeli data shows the vaccine was 97% effective in preventing symptomatic disease, severe disease and death. That is basically in line with the 95% efficacy Pfizer and BioNTech reported from the vaccine's late-stage clinical trial in December.
The analysis also shows real-world evidence of the vaccine's effectiveness against a highly infectious variant of COVID-19 first discovered in Britain, known as B.1.1.7. More than 80% of the tested specimens when the analysis was conucted were variant B.1.1.7. ■