Provinces and territories are expanding eligibility for fourth doses of the COVID-19 vaccine to millions of Canadians.

The National Advisory Committee on Immunization this week recommended second booster doses for residents aged 70 and older.

Here is where things stand so far:

Newfoundland and Labrador: Fourth doses are available to immunocompromised individuals at least 22 weeks after their previous dose.

New Brunswick, Nova Scotia, Prince Edward Island: Health authorities are updating guidance, expected to be announced in the coming days.

Quebec: Fourth doses are given to anyone aged 70 and older, residents of long-term care and seniors' homes, and immunocompromised people. Those aged 60 and older will be eligible for a second booster starting next week.

Ontario: Fourth doses are open to anyone aged 60 and older with a recommended interval of five months after the initial booster dose. Indigenous peoples, Inuit, Métis and their non-Indigenous family members aged 18 and older.

Manitoba: Fourth doses are offered to residents in care homes and seniors in community housing, people aged 70 and older, and Indigenous peoples, Inuit and Métis aged 50 and older regardless of where they live. The province stated a second booster should be given at least six months after the last booster dose.

Saskatchewan: Fourth doses are given to residents in long-term care, special care and personal care homes, stem cell and organ transplant recipients, and those who are severely immunocompromised.

Alberta: Fourth doses are available to those aged 12 and older who are immunocompromised. Starting next week, fourth doses will be available for all seniors in care, those aged 70 and over, as well as Indigenous peoples aged 65 and over. Eligible people can book their fourth dose provided at least five months have passed since the third.

British Columbia: A fourth dose is provided for seniors, starting with residents in long-term care and assisted living. Those over 70 in the community, Indigenous peoples aged 55 and older, and those at high risk will also be included.

Yukon: Starting next week, Yukon will begin offering fourth doses of the COVID-19 vaccine to immunocompromised individuals, those aged 70 and older, or living in a long-term care facility.

Northwest Territories: The Northwest Territories offer fourth doses of the COVID-19 vaccine to immunocompromised people aged 12 and older, people aged 60 and older living in long-term care, and all people aged 80 and older.

Nunavut: A spokesperson for Nunavut's Department of Health said no decision has yet been made on when fourth doses of the COVID-19 vaccine will be available.