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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Last Reviewed: January 26, 2024

Background Knowledge3
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Adverse Events Following Immunization (AEFI)

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The Canadian Vaccination Evidence Resource and Exchange Centre (CANVax)

Adverse Events Following Immunization (AEFI)

Vaccine Safety and Possible Side Effects

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Global landscape analysis of no-fault compensation programmes for vaccine injuries: A review and survey of implementing countries

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Adverse Events Following Immunization (AEFIs) for COVID-19 in Ontario

Safety Monitoring of COVID-19 Vaccine Booster Doses Among Persons Aged 12–17 Years — United States, December 9, 2021–February 20, 2022

Safety Monitoring of Pfizer-BioNTech COVID-19 Vaccine Booster Doses Among Children Aged 5–11 Years — United States, May 17–July 31, 2022

The Canadian Vaccination Evidence Resource and Exchange Centre (CANVax)