Reports of myocarditis and pericarditis after COVID-19 vaccination: Communiqué to health practitioners

In May 2021, international reports of myocarditis (inflammation of the heart muscle) and pericarditis (inflammation of the lining around the heart) following vaccination with COVID-19 mRNA vaccines emerged, including from Israel and the United States. Follow-up on these cases is ongoing. No clear association has been established between myocarditis/pericarditis and mRNA vaccines, and to date, no regulatory action has been taken in Canada or internationally.