Year long study of myocarditis and myopericarditis following two dose regimen of both Pfizer and Moderna vaccines demonstrate rate of occurrence well below p < 0.001, or 0.1% threshold. Moderna is more likely of the two to produce symptoms.
New Study Provides Reassuring Data on Myocarditis Heart Condition After mRNA COVID Vaccination
"For example, of 3,482,295 individuals vaccinated with Pfizer-BioNTech, 48 developed myocarditis or myopericarditis within 28 days of vaccination (an absolute rate of 1.4 per 100,000) compared with unvaccinated individuals.
Among women, the absolute rate was 1.3 per 100,000 and in men it was 1.5 per 100,000. Among 12-39 year olds, the absolute rate was 1.6 per 100,000, and in the youngest age group (12-17 year olds) it was only 1 per 100,000 within 28 days of receiving the Pfizer-BioNTech vaccine."