What we know
The vaccine safety group says the “relatively few” reports of myocarditis “appear to be mild” and are below the expected baseline rates.
Among the cases, the heart condition appeared in adolescents and young adults, and more often in men than women. Symptoms typically appeared within four days after the second dose. Follow-up on the cases is ongoing, the work group said.
"Information about this potential adverse event should be provided to clinicians to enhance early recognition and appropriate management of persons who develop myocarditis symptoms following vaccination," the work group concluded.
What is myocarditis and what are the symptoms?