Second vaccine doses raise the risk of myocarditis in young men, but the condition remains very rare.

Here’s what you need to know:

ImageA student receives the Pfizer-BioNTech vaccine at James Madison High School in the Bronx in September.
Credit…James Estrin/The New York Times

A second dose of the coronavirus vaccines made by Pfizer-BioNTech and Moderna can nearly triple the chances of a rare heart condition in young men, according to a large new study published on Monday. But the absolute risk of the condition, called myocarditis, remains extremely low.

The study found 5.8 cases per million second doses in men, with an average age of 25 years. The risk after the first dose was much less, at 0.8 cases per million, not more than normally would be seen in that age group. The findings were published in the journal JAMA Internal Medicine.

The results may be underestimates. The researchers…

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