Pfizer says early data signals COVID-19 vaccine is more than 90% effective; company on track for emergency use application

Still, Monday’s announcement doesn’t mean for certain that a vaccine is imminent: This interim analysis, from an independent data monitoring board, looked at 94 infections recorded so far in a study that has enrolled nearly 44,000 people in the U.S. and five other countries. Some participants got the vaccine, while others got dummy shots.