Corrected paper debunks link between mRNA vaccines and heart issues.

A claim that mRNA COVID-19 vaccines "dramatically increase" the risk of certain heart problems is false. The claim was based on a research abstract that was corrected in 2021 by having all of the language used in the post and its conclusion removed. The abstract did not have any data about myocardial T-cell infiltration, which is a marker necessary for a myocarditis diagnosis. It also relied on anecdotal evidence without being clear about it, and it lacked statistical analyses for significance, which is the standard needed to prove cause and effect. The revised title of the abstract reflects the inability to make a cause-and-effect finding. The only statistically significant correlation connecting COVID-19 vaccines to heart issues is an increased risk of myocarditis in young men, which is less than the risk of developing myocarditis after contracting COVID-19.