Last Reviewed: July 30, 2019
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
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