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Incidence of myocarditis/pericarditis following mRNA COVID-19 vaccination among children, younger adults in the US

Incidence of myocarditis/pericarditis following mRNA COVID-19 vaccination among children, younger adults in the US

In a population-based surveillance published in the Annals of Internal Medicine, the authors found that myocarditis/pericarditis 0 to 7 days after mRNA vaccination in persons aged 5 to 39 years occurred in approximately 1 in 200,000 doses after the first dose and 1 in 30,000 doses after the second dose of the primary series, and 1 in 50,000 doses after the first booster. The incidence varied markedly by age and sex, however, with a disproportionate number of cases occurring in male persons, notably among adolescents after dose 2 and first boosters.