Why mRNA-based COVID-19 vaccines can cause myocarditis https://www.science.org/doi/10.1126/scitranslmed.adq0143 mRNA-based COVID-19 vaccines can cause myocarditis, but COVID is worse. A case of COVID-19 is ~ 10 times as likely to induce myocarditis as an mRNA-based COVID-19 vaccination https://med.stanford.edu/news/all-news/2025/12/myocarditis-vaccine-covid.html