Myocarditis after Covid-19 Vaccination in a Large Health Care Organization | NEJM
https://www.nejm.org/doi/full/10.1056/NEJMoa2110737
"10.69 cases per 100,000 in male patients between the ages of 16 and 29 years."
Pfizer only according to the study. Quite concerning as Moderna appears to be even more dangerous than Pfizer.
...and all this risk for a vaccine that is proving to be nearly totally ineffective at preventing infection after just a few months: https://www.nature.com/articles/d41586-021-02689-y