Cases of Myocarditis/Pericarditis after Receipt of mRNA Vaccines

On May 17th, the CDC Vaccine Safety Technical (VaSt) Work Group released a statement on reports of myocarditis following mRNA vaccines. VaST concluded that there are relatively few reports of myocarditis to date and that these cases seem to occur:

  • predominantly in adolescents and young adults,
  • more often in males than females,
  • more often following dose 2 than dose 1, and
  • typically within 4 days after vaccination.

Please report cases of myocarditis or pericarditis after vaccination promptly to the U.S. Vaccine Adverse Events Reporting System (VAERS).

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