Adverse Events Following Immunization (AEFIs) for COVID-19 in Ontario: December 13, 2020 to September 11, 2022

Public Health Ontario

This report provides a summary of adverse events following immunization (AEFIs) that are temporally associated (i.e., occur after receiving the vaccine) with receipt of COVID-19 vaccine and meet the provincial surveillance definitions (i.e., confirmed). It is important to note that AEFIs described in this report are defined as any untoward medical occurrences that followed immunization and do not necessarily have a causal relationship with the vaccine.

This summary includes AEFIs reported in the Public Health Case and Contact Management Solution (CCM) as of September 11, 2022. Doses administered up to and including September 11, 2022 are extracted from the Ontario Ministry of Health’s COVaxON application (see technical notes for details on data sources). The report is updated on a bi-weekly basis.

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