Interesting titbit from the Pfizer study - the attack rate in the general population and the people who had already had COVID-19 was similar. 1.3% of people who had COVID-19 antibodies BEFORE vaccination got infectedpic.twitter.com/c4rJ8TGQn5
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This is indeed odd. According to the protocol, PCR was also done at the first vaccination visit - could these all have been false negatives? The striking accumulation of (presumed) reinfections at the beginning of the trial suggests they aren't real reinfections, it seems.
Another point! We don't know if the serology was test-adjusted, and they appear to have run IgG and IgM (as per the protocol). Possible that some of these are false +ves, we really need a lot more info on the group
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