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Innocuité des vaccins

In Ontario, health professionals are required to report adverse events following immunization (AEFIs) to their local public health unit. Public health units investigate adverse events and provide support to immunizers, individuals and their families. Public Health Ontario analyzes AEFIs that are reported in Ontario to monitor the safety of administered vaccines and contribute to national and international vaccine safety surveillance systems.

What is an AEFI?

An adverse event following immunization is an unwanted or unexpected health effect that happens after someone receives a vaccine,
which may or may not be caused by the vaccine. If you have an AEFI, contact your health care provider.


For public health units
Photo of children holding hands Photo of woman on the phone Photo of man presenting


The Annual Report on Vaccine Safety in Ontario, 2014 is a comprehensive annual provincial assessment of vaccine safety, and includes a summary of adverse events following immunization (AEFI) reported in Ontario in 2014.




Surveillance forms

Guidance documents

Training resources

To access a recording of our iPHIS training webinar, please contact

Vaccine Safety Surveillance Workshop, 2013

Vaccine Safety: Strength in numbers

Vaccine Safety: it's everyone's business!

Not a shot in the dark: Restoring confidence in vaccine safety
October 9, 2012

Adverse event reporting for new vaccines
April 4, 2012 

Related Links
Contact us
Immunization & Vaccine Preventable Diseases:

If you are a health care provider or member of the public with questions about vaccine safety or AEFI reporting, please contact your local public health unit.

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© , Ontario Agence de protection et de promotion de la santé