CPHA Canvax

Adverse Events Following Immunization (AEFI)

Adverse Events Following Immunizations (AEFI) are unwanted or unintended medical occurrences following immunization, which may or may not be caused by the use of the vaccine. In Canada, surveillance systems are in place to monitor and report AEFI to ensure vaccine safety.  

Government of Canada. 2018. Reporting Adverse Events Following Immunization (AEFI) in Canada

Resources highlighted on this page have been specially curated for quick browsing. For more resources on this topic, search through the CANVax database using the search engine.    

Last Reviewed: January 26, 2024