Takeaway

• Myocarditis after SARS-CoV-2 vaccination remains rare.
• Vaccination may reduce myocarditis risk.
• But vaccine-associated myocarditis risk soon after second mRNA-1273 (Moderna) rivals—and, in young men, exceeds—infection-associated myocarditis risk.

Why this matters

• Vaccination against SARS-CoV-2 can prevent severe outcomes in COVID-19.
• The perceived risk for vaccine-associated myocarditis may discourage vaccination.

Key results...