What The Study Did: In this population-based study of almost 2.4 million people who received at least one dose of COVID-19 mRNA vaccines, acute myocarditis was rare, at an incidence of 5.8 cases per 1 million individuals after the second dose (1 case per 172,414 fully vaccinated individuals). The signal of increased myocarditis in young men warrants further investigation.
Authors: Ming-Sum Lee, M.D., Ph.D., of the Kaiser Permanente Los Angeles Medical Center, is the corresponding author.
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(doi:10.1001/jamainternmed.2021.5511)
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JAMA Internal Medicine