‘Healthy Vaccinee Bias’ May Have Led to Inflated Efficacy Claims of Pfizer’s Covid Booster

Written by Megan Redshaw

In a Letter to the Editor published in the New England Journal of Medicine on July 20, epidemiologist Dr. Tracy Høeg, physician-scientist Dr. Vinay Prasad, and Dr. Ram Duriseti from Stanford School of Medicine stated that a 2021 Israeli study on Pfizer’s COVID-19 booster may have overestimated the vaccine’s effectiveness by concluding those who received a booster had 90 percent lower mortality due to COVID-19 than non-boosted participants

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