We’ve talked about vaccinating children and the side effects of myocarditis here before. I’m not sure if this is new data in the New York Times this morning…
The coronavirus vaccines made by Pfizer-BioNTech and Moderna may have caused heart problems in more than 1,200 Americans, including about 500 who were younger than age 30, according to data reported on Wednesday by researchers at the Centers for Disease Control and Prevention.
Still, the benefits of immunization greatly outweigh the risks, advisers to the C.D.C. said. They strongly recommended vaccination for all Americans 12 and older.
The heart problems are myocarditis, inflammation of the heart muscle; and pericarditis, inflammation of the lining around the heart. The risk is higher after the second dose of an mRNA vaccine than the first, and much higher in men than in women. Researchers do not know why.
But the side effect is very uncommon, just 12.6 cases per million second doses administered.
C.D.C. researchers estimated that every million second doses given to boys ages 12 to 17 might cause a maximum of 70 myocarditis cases, but would prevent 5,700 infections, 215 hospitalizations and two deaths.
Agency researchers presented the data to members of the Advisory Committee on Immunization Practices, which makes recommendations on vaccine use in the United States. (The scientists grouped together pericarditis and myocarditis for reporting purposes.)
Most cases were mild, with symptoms like fatigue, chest pain and disturbances in heart rhythm that quickly cleared up, the researchers reported. Of the 484 cases reported in Americans under age 30, the C.D.C. has definitively linked 323 cases to vaccination. The rest remain under investigation.