Vaccine Safety Surveillance
Use this interactive tool to explore and download vaccine safety surveillance data in Ontario.
Click the tabs below to view selected adverse events following immunization (AEFI) data by trends over time, age and sex, public health unit, type of vaccine and type of adverse event. Within each tab, use the filters to interact with the chart or graph.
What is an AEFI?
- An AEFI (adverse events following immunization) is an unwanted or unexpected health effect that happens after someone receives a vaccine.
- An AEFI may or may not be caused by the vaccine.