Pfizer Says Trials Show COVID Vaccine Is 90% Effective, But Questions Remain on Safety of Novel Tech

“Because there’s never been a licensed mRNA vaccine before, we really don’t know what injuries are going to look like.” — Mary Holland

Pfizer announced Monday preliminary analysis of its COVID-19 vaccine trials indicates the vaccine will be more than 90% effective. The news sent stocks soaring and had the media all but doing cartwheels.

Pfizer CEO Albert Bourla told CNN the vaccine is “the greatest medical advance” in the world’s last hundred years. He told ABC News that the drugmaker “feels very good about the safety.”

But the New York Times pointed out that Pfizer’s data — delivered in a news release, not a peer-reviewed medical journal — “is not conclusive evidence that the vaccine is safe and effective, and the initial finding of…