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Vaccine Safety

For health professionals
How to report an AEFI:
  1. Complete an AEFI reporting form
  2. Send it to your local public health unit
See our AEFI reporting fact sheet (November 2017) for more information.
Having trouble opening PDF forms? Download and save the form directly onto your device.

Monitoring and communicating about vaccine safety is essential to the success of immunization programs. We support Ontario’s immunization stakeholders to better understand and communicate about vaccine safety. Public Health Ontario also leads the provincial surveillance of adverse events following immunization (AEFIs). We monitor and evaluate vaccine safety and contribute to national and international surveillance systems.

In Ontario, health professionals are required to report AEFIs to their local public health unit. Public health units investigate AEFIs and provide support to immunizers, individuals and their families. An 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.

Vaccine Safety Net Member logo
Public Health Ontario is a member of
Vaccine Safety Net – a global network of websites, evaluated by the World Health Organization, that provides reliable information on vaccine safety

Kids Huddled

​Now available, 2017 Vaccine Safety Data! NEW

Check out the new resources on vaccine safety in Ontario, including the 2017 report on vaccine safety and the updated vaccine safety surveillance tool.

Report on Vaccine Safety in Ontario, 2017

Vaccine Safety Surveillance tool
Use this interactive tool to explore and download vaccine safety data.

Contact us

For public health units: 
Please contact Immunization and Vaccine Preventable Diseases at

For the public:
If you experience an adverse event after immunization, please contact your health care provider.

For health care providers: 
For questions about vaccine safety, please contact your local public health unit.

Page last reviewed:
Page last updated: 2019-01-23 12:30 PM
Uncontrolled print copy. Valid only on day of Print: [date]
Page updated on [date/time] 2019-01-23 12:30 PM
© , Ontario Agency for Health Protection and Promotion