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Myocarditis

Myocarditis is a condition of inflammation of the heart muscle, and pericarditis is inflammation of the outer lining of the heart. Myopericarditis is where both occur simultaneously. In all three cases, the body’s immune system causes inflammation in response to an infection or some other trigger.

Increased occurrence of myocarditis, pericarditis and myopericarditis has been associated with Covid-19 inoculations, along with Covid-19 infection.

COVID-19 Pandemic and Vaccines

Incidence of Myocarditis Following the Second Dose of a Covid-19 mRNA Vaccine
Age 12 - 17 Age 18 - 24
Kaiser Permanente Study posted Dec 27, 20211) 1/1860 1/2650
Nature Medicine Paper posted Dec 25, 20212) ½ ⅙

Risk of Myopericarditis following COVID-19 mRNA vaccination in a Large Integrated Health System: A Comparison of Completeness and Timeliness of Two Methods

Mechanisms of Action

Pausing Moderna’s COVID Vaccine for Younger Age Groups

On October 6, 2021 Sweden and Denmark said they will pause the use of Moderna’s COVID vaccine for younger age groups after reports of side effects, including myocarditis and pericarditis. Following suit was Finland October 7, Iceland October 8 and France November 8.

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