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Before COVID-19 the incidence of myocarditis was between one and 10 cases per 100,000 people per year. Rates are highest in males between 18 and 30 years old. Interestingly, most cases of myocarditis in the highest risk group are in otherwise healthy and active people.

According to the U.S. Centers for Disease Control and Prevention, the risk of myocarditis after infection with COVID-19 is much higher, at 146 cases per 100,000. The risk is higher for males, older adults (ages 50+) and children under 16 years old. Soccer player Alphonso Davies, 21, of Canada’s national men’s team, was sidelined by heart inflammation after having COVID-19.

Myocarditis following COVID-19 vaccination is rare and the risk is much smaller than the risks of cardiac injury linked to COVID-19 itself
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Based on a study out of Israel, the risk of post-vaccine myocarditis is 2.13 cases per 100,000 vaccinated, which is within the range usually seen in the general population. This study is consistent with others in the United States and Israel which put the overall incidence of post-vaccine myocarditis between 0.3 and five cases per 100,000 people.
 

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