Acute Myocarditis Following COVID-19 mRNA
Acute Myocarditis Following COVID-19 mRNA Vaccination in Adults Aged 18 Years or Older
Recently, there have been reports of acute myocarditis following COVID-19 mRNA vaccine administration.4-6 We evaluated acute myocarditis incidence and clinical outcomes among adults following mRNA vaccination in an integrated health care system in the US.
There were 15 cases of confirmed myocarditis in the vaccinated group (2 after the first dose and 13 after the second), for an observed incidence of 0.8 cases per 1 million first doses and 5.8 cases per 1 million second doses over a 10-day observation window (Table 1). All were men, with a median (IQR) age of 25 (20-32) years. Among unexposed individuals, there were 75 cases of myocarditis during the study period, with 39 (52%) men and median (IQR) age of 52 (32-59) years. The IRR for myocarditis was 0.38 (95% CI, 0.05-1.40) for the first dose and 2.7 (95% CI, 1.4-4.8) for the second dose. Sensitivity analyses using vaccinated individuals as their own controls showed similar findings (Table 1).
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