U.S. officials probe whether Moderna vaccine is linked to higher risk of uncommon side effect

Federal health officials are investigating emerging reports that the Moderna coronavirus vaccine may be associated with a higher risk of a heart condition called myocarditis in younger adults than previously believed, according to two people familiar with the review who emphasized the side effect still probably remains uncommon.

The investigation, which involves the Food and Drug Administration and the Centers for Disease Control and Prevention, is focusing on Canadian data that suggests the Moderna vaccine may carry a higher risk for young people than the Pfizer-BioNTech vaccine, especially for males below the age of 30 or so. The authorities also

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