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This is from Government of Canada website:

Preliminary guidance on key populations for early COVID-19 immunization

Key populations include:
Those at high risk of severe illness and death from COVID-19

Advanced age
Other high-risk conditions (to be defined as the evidence base evolves)
Those most likely to transmit COVID-19 to those at high risk of severe illness and death from COVID-19 and workers essential to maintaining the COVID-19 response

Healthcare workers, personal care workers, and caregivers providing care in long-term care facilities, or other congregate care facilities for seniors
Other workers most essential in managing the COVID-19 response or providing frontline care for COVID-19 patients
Household contacts of those at high-risk of severe illness and death from COVID-19
Those contributing to the maintenance of other essential services for the functioning of society

To be defined, prioritized and informed by federal/provincial/territorial (FPT) discussions
Examples: those who cannot work virtually and have differential exposure to COVID-19 (e.g., police, firefighters, grocery store staff)
Those whose living or working conditions put them at elevated risk of infection and where infection could have disproportionate consequences, including Indigenous communities

To be defined based on COVID-19 epidemiology and previous pandemic experience
Examples: settings where physical distancing and other infection prevention and control measures are challenging, access to healthcare infrastructure is reduced, and infection could have disproportionate consequences

https://www.canada.ca/en/public-heal...unization.html