Commentary
Periodically during the COVID-19 pandemic, CDC scientific staff have employed their available studies’ data to estimate the efficacy of current or recent versions of COVID-19 vaccines to reduce risk of testing positive for COVID-19. While the fact of “testing positive” has been somewhat controversial because of the secret PCR Ct threshold numbers involved that have allowed for uninfectious people with unrecognized COVID-19 from some weeks in the past to remain test-positive, my goal here is to illustrate CDC’s problematic epidemiologic methods that have substantially inflated the vaccine efficacy percents that they have reported.
