Moderna says Covid vaccine has fewer breakthrough cases than Pfizer’s, but higher myocarditis rates in young men

Moderna defended the use of its Covid-19 vaccine Thursday, saying the protection it offers against severe disease, hospitalization and death outweighs the risk of myocarditis, a rare heart condition seen in a small number of young men who received the shot.

The company announced last week that the Food and Drug Administration needed more time to decide whether to authorize its two-dose vaccine for use in children ages 12 to 17 as the agency looks into reports of myocarditis, or the inflammation of the heart muscle. ...