Multiple passive surveillance systems reported the incidence of myocarditis or pericarditis or both in individuals who received COVID-19 mRNA vaccines in Europe, the USA, Canada, and Israel in 2021. 1-3 In a retrospective cohort study, researchers analyzed four commercial health plan claims databases to determine the risk of these conditions following mRNA-1273 or BNT162b2 COVID-19 vaccines administration . 1 The databases hold records of more than 100 million people. People aged 18 to 64 who received at least one dose of COVID-19 mRNA vaccine were included in the study.
People with a previous history of myocarditis or pericarditis were excluded from the study. Key findings Events of myocarditis, pericarditis, or both were found 411 times among 15,148,369 individuals aged 18 to 64 who received the mRNA-1273 and BNT162B2 vaccines. The events occurred 284 times in men and 127 times in…
