COVID-19 epidemiology update: Cases following vaccination:

We no longer report data on cases following vaccination. We used to publish data on the vaccination status of COVID-19 cases, hospitalizations and deaths to help understand the impact of vaccination on COVID-19. We can no longer use this data for this purpose for the following reasons.

• A rapid increase in cases (starting in December 2021) led to changes in testing policies in order to preserve testing capacity. People at high risk of severe disease were now prioritized for laboratory testing. These same people were also prioritized for COVID-19 boosters. This meant that the people being tested were more likely than the general population to have received boosters and to get severe illness. This leads to a data bias which could cause people to mistakenly conclude that more vaccines lead to severe disease.
• Most Canadians, whether vaccinated or not, have had COVID-19 at least once. This makes it difficult to separate the impacts of immunity from disease, immunity from vaccine and immunity from both. Learn more about hybrid immunity.

There are other resources that provide analyses and evidence of the impact of vaccination on COVID-19 outcomes, including:

• Provincial and territorial data
• COVID-19 vaccine chapter of the Canadian Immunization Guide
• Statements and guidance documents published by the National Advisory Committee on Immunization

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