See the link for the source, a Pfizer press release. "Authorized or approved mRNA COVID-19 vaccines show increased risks of myocarditis (inflammation of the he

See the link for the source, a Pfizer press release. "Authorized or approved mRNA COVID-19 vaccines show increased risks of myocarditis (inflammation of the heart muscle) and pericarditis (inflammation of the lining outside the heart), particularly within the first week following vaccination." https://www.pfizer.com/news/press-release/press-release-detail/pfizer-amends-us-government-paxlovid-supply-agreement-and https://www.pfizer.com/news/press-release/press-release-deta...