Adverse Events Following Immunization

An adverse event following immunization (AEFI) is an unwanted or unexpected health effect that happens after someone receives a vaccine, which may or may not be caused by the vaccine. Health care providers (i.e., physicians, nurses and pharmacists) are required by law to report AEFIs.

Reports of adverse reactions occurring in the Thunder Bay District should be made using the Ontario AEFI Reporting Form (PDF) and faxed to the Vaccine Preventable Disease department of the Thunder Bay District Health Unit at (807) 625-4828.

Last Updated: 24/05/2017