The CDC’s Advisory Committee on Immunization Practices met Friday to debate the risks of developing myocarditis after receiving Moderna’s or Pfizer’s vaccines.
Myocarditis is an inflammation of the heart muscle that can result in serious health problems, according to the National Heart, Lung and Blood Institute. Though myocarditis is most common after a viral infection, the CDC has found a link between heart inflammation and vaccination with Moderna and Pfizer’s shots.
The risk of myocarditis after Covid vaccination is highest in teenage boys and young men following the second dose of mRNA vaccines, the technology used by both Moderna and Pfizer. Symptoms develop within a few days after vaccination, including chest pain, shortness of breath, heart palpitations and fatigue.
Though rare, Pfizer and Moderna’s vaccines have both been linked to a risk of myocarditis. However, the risk was higher following the second dose of Moderna’s vaccine in people ages 18 to 39, according to the CDC’s safety surveillance program, which gathers data from nine health-care organizations in eight states.
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