How Moderna’s Early Vaccine Results Compare with Pfizer’s

[Learn extra on Moderna’s Covid-19 vaccine.]

Pfizer offered much less element in its announcement final week on Nov. 9 than Moderna did on Monday, Nov. 16. Pfizer’s outdoors board of specialists analyzed 94 volunteers and estimated that the effectiveness of its vaccine was over 90 p.c. They didn’t specify how many individuals who acquired sick had acquired the vaccine or the placebo.

Nonetheless, the estimates for the 2 vaccines are clearly in the identical ballpark. What’s extra, they each far exceed the F.D.A.’s requirement that coronavirus vaccines have an efficacy of greater than 50 p.c.

Pfizer didn’t report what number of volunteers had extreme Covid-19, or what fraction of these folks acquired the vaccine. Findings like these are anticipated to come back out within the subsequent few weeks.

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