What you need to know about the Johnson & Johnson coronavirus vaccine headed toward approval

A panel of vaccine advisers at the Food and Drug Administration will meet Friday to discuss whether the agency should grant emergency use authorization to the COVID-19 vaccine developed by Johnson & Johnson-owned Janssen Pharmaceuticals. Here are the answers to the most pressing questions.

How efficacious is the vaccine?

The FDA’s panel of vaccine experts reported Wednesday that the vaccine was 66% effective overall in preventing moderate and severe COVID-19 cases. The vaccine was also demonstrated to by roughly 85% effective overall at preventing hospitalization and 100% effective at preventing death in all three regions where the shot was tested.

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