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(Bloomberg) -- Moderna shares fell after a report that US regulators had put a decision on authorization of its COVID-19 shot for younger kids on hold over concerns about heart-related side effects.

The Wall Street Journal reported, citing unidentified people familiar with the matter, that the Food and Drug Administration is delaying a decision on allowing younger people to receive the vaccine while it looks into whether it may lead to heightened risk of myocarditis, a rare inflammatory heart condition. Shares of the biotechnology company were down 2.2 percent at $324.59 at 12:33 p.m. on Friday in New York.

Moderna’s vaccine is currently authorized for people 18 years or older in the US. Representatives for the FDA didn’t immediately respond to a request for comment.

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