A preprint of a non-peer-reviewed study about vaccine myocarditis risk has been withdrawn due to a miscalculation.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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There is widespread, understandable confusion about the risk of myocarditis after vaccination. Explaining that health authorities are monitoring reports of myocarditis and pericarditis, that cases are rare, and that the benefits of the vaccine greatly outweigh the risks is recommended. Fact Checking Source(s): Reuters, University of Ottawa Heart Institute
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