Here’s all the data on myocarditis cases linked to COVID-19 vaccines

Enlarge (credit: Getty | Paul Hennessy)

Scientists from the Centers for Disease Control and Prevention and a committee of independent expert advisers convened Wednesday to lay out and discuss everything they know about rare cases of myocarditis-inflammation of the heart muscle-in people who have recently received an mRNA-based COVID-19 vaccine, which is either Moderna's vaccine or the Pfizer/BioNTech vaccine.

The experts focused on adolescents and young adults, who have had the highest rates of vaccine-linked myocarditis cases of any vaccinated age group. Though, to be clear, all of the rates here-even the relatively high ones-are actually very low.

Still, data on this possible side effect is accumulating at a precarious time for the country's vaccination efforts. The Food and Drug Administration authorized the Pfizer/BioNTech vaccine for use in adolescents 12 to 15 years old just last month. So far, CDC data suggests those ages 12 to 17 have the highest rates of myocarditis cases by vaccine doses given. And the FDA is poised to review vaccine authorizations for even younger age groups in the coming months.

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