Correspondence: Myocarditis after Covid-19 mRNA Vaccination

“The Centers for Disease Control and Prevention recently reported cases of myocarditis and pericarditis in the United States after coronavirus disease 2019 (Covid-19) messenger RNA (mRNA) vaccination. In recently published reports, diagnosis of myocarditis was made with the use of noninvasive imaging and routine laboratory testing. Here, we report two cases of histologically confirmed myocarditis after Covid-19 mRNA vaccination…

In these two adult cases of histologically confirmed, fulminant myocarditis that had developed within 2 weeks after Covid-19 vaccination, a direct causal relationship cannot be definitively established because we did not perform testing for viral genomes or autoantibodies in the tissue specimens. However, no other causes were identified by PCR assay or serologic examination.”