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https://www.hartgroup.org/first-finding-from-pfizer-trials/

"There were 165 people who started with negative antibodies but became positive during the trial in the placebo arm. That is a pretty close match to the 162 who were positive by PCR testing. However there were 75 in the vaccine arm, far more than the 8 claimed by PCR testing. That would mean that treatment only reduced the risk of infection by about half the 95% claimed.

Only 40% of people who had been given Moderna produced N-antibodies after symptomatic, PCR positive infection. Moderna and Pfizer have products that are very similar in terms of mechanism of action, so it is not unreasonable to assume that a similar issue would be seen with Pfizer.

If that is the case, then the 75 figure would only be a fraction of the people in the treatment arm who had been infected. Assuming the 40% figure holds, that would mean that there was no efficacy from Pfizer vaccination against risk of infection when measuring the entire period from first needle to end of the trial. "

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