Additional dose of COVID-19 vaccine for targeted groups

The Ministère de la Santé et des Services sociaux has provided guidelines for the administration of an additional dose of COVID-19 vaccine following the recommendation of the Comité sur l'immunisation du Québec (CIQ). 

Opinion on the appropriateness of an additional dose of COVID-19 vaccine for immunocompromised individuals (in French only)

Interval between the two doses of COVID-19 messenger RNA vaccines in immunosuppressed individuals (in French only)

Given the high circulation of the Delta variant, a third dose would provide better protection against COVID-19 for immunosuppressed individuals and those on dialysis.

The recommendation to receive a third dose, preferably with a COVID-19 messenger RNA vaccine, applies to the following groups, 12 years and older:

  • people on dialysis
  • people with weakened immune systems, i.e. those :
    • who are undergoing chemotherapy or radiotherapy
    • who are taking medications that affect their immune system
    • who are living with HIV and have a CD4 cell count of less than 500/mm3 and/or are not taking their treatment)

There should be a minimum interval of four weeks between the second and third dose.

The additional dose is required even if the person has already had COVID-19.

The people concerned can make an appointment online to obtain the additional dose, by accessing the Clic Santé platform and selecting the service COVID-19 Vaccine – 3rd dose.

Alternatively, people can make an appointment by telephone at 514 644-4545 or 1 877 644-4545 between 8:00 a.m. and 8:00 p.m., Monday through Friday and 8:30 a.m. to 4:30 p.m. Saturday and Sunday. Press 9 to get the English menu and follow the instructions to speak to an agent covering this region: Centre Ouest de l'île de Montréal and McGill University Health Centre. Please do not call the MUHC directly as our Call Centre agents cannot make any changes to vaccination appointments. You must go through these numbers; 514 644-4545 or 1 877 644-4545 to change your appointment.