that was a study on mask promotion where they determined
Posted on: February 1, 2022 at 13:18:17 CT
CulturedDan KC
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the case rate by the number of participants from two SE Asian villages who called in to a hotline to report symptoms. Of the few individuals who called in, they then did blood draws on the smaller amount of them to see if they had covid-19 antibodies - without determining if exposure happened before or after the initiation of the study.