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Mayo Clinic researchers are taking a close look at rare cases of inflammation of the heart muscle, or myocarditis, in young men who developed symptoms shortly after receiving the second dose of the Moderna or Pfizer messenger RNA (mRNA) COVID-19 vaccines.
Very rare reports received worldwide of myocarditis with a possible link to the use of mRNA vaccines against COVID-19 are currently under investigation.
A small number of teens and young adults have experienced heart inflammation after receiving mRNA COVID-19 vaccines produced by Pfizer and Moderna, the U.S. Centers for Disease Control and Prevention reports.
Reports of myocarditis in a small number of teens and young adults who have received COVID-19 vaccines are being investigated by the U.S. Centers for Disease Control and Prevention.