![]() ![]() Mild cases are likely underdiagnosed as cardiac magnetic resonance imaging (CMR) is not commonly performed even in suspected cases and not at all in asymptomatic and mildly symptomatic patients. The clinical course is generally mild with rare cases of left ventricular dysfunction, heart failure and arrhythmias. Rates of vaccine-associated myocarditis vary by age and sex with the highest rates in males between 12 and 39 years. ![]() Although generally very safe, post-vaccine myocarditis can result from adaptive humoral and cellular, cardiac-specific inflammation within days and weeks of vaccination. Over 10 million doses of COVID-19 vaccines based on RNA technology, viral vectors, recombinant protein, and inactivated virus have been administered worldwide. ![]()
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