Myocarditis extremely rare among vaccinated people
Out of the 2.3 million people who received at least one Pfizer or Moderna dose, only 15 people developed myocarditis, or heart tissue inflammation, according to a new Kaiser Permanente study published in the Journal of the American Medical Association.
All 15 cases were among young men around the age of 25. Eight people had the Pfizer vaccine and seven had Moderna.
None of the 15 cases required being admitted to the ICU and all of them recovered, the study said.
In comparison, out of the nearly 1.6 million patients who had not been vaccinated, 75 people developed myocarditis, according to the study.
-ABC News' Eric M. Strauss