They are not the same number. The efficacy rate during the Pfizer trial was essentially the ratio of the positives of the test group and the placebo group. This ratio was 20 to 1, or 5%, and reflects the reduction in the probability of catching COVID if exposed. The number of breakthrough cases during the trial for the test group was 8 out of 21,000 or 0.04%, not 5%. The current CDC reported breakthrough rate (for the fully vaccinated) is probably undercounted at 0.008%.
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Originally Posted by golfing eagles
Also agree (scary, isn't it?). We don't know if it is a 1 off, or a variant, or the beginning of a new set of numbers from the CDC. I am pretty sure that 5318/85 million won't hold---there will be more breakthrough cases as time goes on. After all, the "real world" number from the CDC is 0.008%, but the research number during the trials was 5%----that's about a 3 order of magnitude difference so something "seems" fishy.
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