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

Pfizer supplied much less element in its announcement final week on Nov. 9 than Moderna did on Monday, Nov. 16. Pfizer’s exterior board of consultants analyzed 94 volunteers and estimated that the effectiveness of its vaccine was over 90 %. They didn’t specify how many individuals who received 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 %.

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

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