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“There is a generally acknowledged myocarditis side effect to the mRNA vaccines, predominantly in young men, and it's invariably in the States been non-fatal,” Moore told Salon in a phone interview.

But federal researchers trailed Israeli scientists in picking up myocarditis as a problem among young men.

Despite surveillance efforts, U.S. officials were not the first to identify a significant Covid vaccine side effect: myocarditis in young people receiving mRNA vaccines.

Traditionally, the focus has been on heart inflammation known as myocarditis, which is often triggered by the body's immune response to a viral infection.

The study included 99 million people across eight countries and found that the first, second and third doses of Pfizer-BioNTech’s and Moderna’s mRNA vaccines were linked to rare cases of myocarditis.