From the CDC
Myocarditis and pericarditis after COVID-19 vaccination are rare. As of September 22, 2021, VAERS has received 1,541 reports of myocarditis or pericarditis among people ages 30 and younger who received COVID-19 vaccine. Most cases have been reported after mRNA COVID-19 vaccination (Pfizer-BioNTech or Moderna), particularly in male adolescents and young adults.
Through follow-up, including medical record reviews, CDC and FDA have confirmed 892 reports of myocarditis or pericarditis. CDC and its partners are investigating these reports to assess whether there is a relationship to COVID-19 vaccination.
Learn more about COVID-19 vaccines and myocarditis.
892 confirmed CASES of Myocarditis/Pericarditis out of 224,000,000 Pfizer doses administered in the US, and that is not death rate that is overall cases identified.