Reports of myocarditis and pericarditis after COVID-19 mRNA vaccines

Advisory Alert

June 18, 2021

*Cette information est seulement disponible en anglais.

To: Health Care Providers


Small number of reports of pericarditis and myocarditis after vaccination

The Public Health Agency of Canada and Health Canada are closely monitoring rare reports of potential myocarditis and pericarditis following a COVID-19 mRNA vaccine. International reports indicate the following:

As part of ongoing COVID-19 vaccine safety efforts, the Public Health Agency of Canada (PHAC), Health Canada, Public Health Ontario and the Ontario Ministry of Health are closely monitoring myocarditis/pericarditis. In Canada, there have been a small number of reports of pericarditis or myocarditis.

Currently, there is no clear association established between myocarditis and pericarditis with mRNA vaccines.  At this time, it is important to note that adverse events taking place after vaccination are not necessarily related to the vaccine. In Canada we are not currently seeing higher rates than would be expected in the general population. To date, no regulatory action has been taken internationally or in Canada. Health Canada continues to work closely with the manufacturers and international regulators to review information as it becomes available. The Weekly report on side effects following immunization in Canada (Government of Canada), provides further information regarding reported side effects.

Additional information

Presently, the benefits of the mRNA vaccines continue to outweigh the risks in the authorized populations. There are clear benefits of mRNA vaccines in reducing deaths and hospitalization due to COVID-19 infections.

Reporting adverse events following immunization

All cases of myocarditis or pericarditis following vaccination should be reported to Public Health Sudbury & Districts:

For additional guidance on AEFI reporting, please visit Public Health Ontario for a reporting overview, or read a summary of all COVID-19 AEFIs in Ontario.

For additional information on the COVID-19 vaccines, as well as for specifics on how it is being rolled out locally, please visit Public Health’s COVID-19 vaccine webpage.


Original Signed By

Dr. Penny Sutcliffe
Medical Officer of Health and Chief Executive Officer

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This item was last modified on June 18, 2021