Earlier quoted context omitted.
https://torontosun.com/news/provincial/ontario-now-recommend... "Ontario now recommending against Moderna vaccine for men 18-24 years old...This comes after public health officials determined there is a 1 in 5,000 risk of myocarditis — a form of heart inflammation — following a second dose of the Moderna vaccine."
Which is, by the way, still multiple orders of magnitude lower than the risk of myocarditis from catching COVID.
Here's the weekly Ontario report on vaccine side effects: at the end is the myocarditis/pericarditis breakdown:
https://www.publichealthontario.ca/en/health-topics/immuniza...