September 28, 2021, Vol 326, No. 12, Pages 1133-1222
Myocarditis and Pericarditis After Vaccination for COVID-19
George A. Diaz, MD; Guilford T. Parsons, MD, MS; Sara K. Gering, BS, BSN; et al.
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JAMA. 2021;326(12):1210-1212. doi:10.1001/jama.2021.13443
This study investigates the incidence of myocarditis and pericarditis emergency department or inpatient hospital encounters before COVID-19 vaccine availability (January 2019–January 2021) and during a COVID-19 vaccination period (February-May 2021) in a large US health care system.