Report Adverse Events After Immunization (for Health Care Professionals)

All vaccine returns must be returned via the Public Health delivery service. Vaccine returns to a Public Health office is no longer possible as all offices are currently closed to the public. All vaccine returns must be accompanied by a vaccine return form.

Reporting adverse events is important and ensures continued safety of vaccines used in Canada.

Who Should Report

Report adverse events if you are a:

  • Vaccine provider
  • Health care professional with patients who may have had a negative side effect
  • Vaccine manufacturers who have received a submitted report

When to Report

Health professionals should report adverse events when there is:

  • A temporal association with a vaccine
  • No other clear cause at the time of reporting
  • Urgent medical attention required (such as life threatening, death, hospitalization)
  • Unusual or unexpected effects

If you are unsure about reporting a side effect following a patient's immunization, report it anyway.

Reporting Form

Fax the completed form to the Vaccine Preventable Disease Program at 905-688-8225.

Additional Information

If you have any questions about reporting adverse events:

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