re: Pfizer final analysis shows coronavirus vaccine is 95% effective with no safety concerns

quote:

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The company counted 170 cases of coronavirus infection among volunteers who took part in the trial. It said 162 infections were in people who got placebo, or plain saline shots, while eight cases were in participants who got the actual vaccine. That works out to an efficacy of 95%, Pfizer said.

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Except that the study design that I previously read didn’t expose all volunteers to the virus directly (which is pretty critical in a design like this), and it didn’t expose them 6 months from the date of onset or a year later to determine if the immunity waned.