Minor calculation error “vastly” inflated myocarditis risk in withdrawn study

A preprint of a non-peer-reviewed study about vaccine myocarditis risk has been withdrawn due to a miscalculation. The study claimed that mRNA COVID-19 vaccines cause a 1 in 1,000 risk of myocarditis. The authors later acknowledged that they under-calculated the number of vaccines that were administered during the study period. The miscalculation resulted in a “vastly” inflated myocarditis risk, according to a statement from the University of Ottawa Heart Institute, where the study was conducted. Prior to its withdrawal, the study was widely circulated on social media and websites known to publish vaccine misinformation.

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The Public Health Communications Collaborative (PHCC) was formed in 2020 to coordinate and amplify public health messaging on COVID-19 and increase Americans’ confidence in guidance from the Centers for Disease Control and Prevention (CDC) and state and local public health officials.

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