Myocarditis or pericarditis are much more likely to follow infection with SARS-CoV2 compared with COVID-19 vaccinations, according to research published today in Morbidity and Mortality Weekly Report.

The study was based on electronic health records from 40 US health care systems from Jan 1, 2021, through Jan 31, 2022, and heart conditions following COVID-19 infections among stratified age groups (5 to 11, 12 to 17, 18 to 29, and ≥30 years). The rates were compared to documented cases of cardiac conditions following one or two doses of mRNA vaccines.

Myocarditis is inflammation of the heart muscle, and pericarditis is inflammation of the tissue that encases the heart.

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