Lancet surveillance study:

Outcomes at least 90 days since onset of myocarditis after covid-19 mRNA vaccination in adolescents and young adults in the USA

Mostly males affected.

6-9% had got a covid infection

87-89% had at least 2 doses of vaccination

104 (26%) of 393 patients were prescribed daily medications related to myocarditis at the last health-care provider encounter