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Of the three vaccine products that have been approved or had emergency use authorization in the United States, all used saline placebo in the clinical trial. From the Pfizer Polack et al paper: With the use of an interactive Web-based system, participants in the trial were randomly assigned in a 1:1 ratio to receive 30 μg of BNT162b2 (0.3 ml volume per dose)...


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It says in the methods (under statistical analysis): For estimates of any or type-specific HPV incidence, only participants who were free of any or a specific HPV type, respectively, at enrolment were included. Since multiple infections are possible within an individual, multiple positive tests were judged as a separate event. So: Yes - 72 people out of ...


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