Fourth Doses of the COVID-19 Vaccine for Immunocompromised Individuals

Our government is continuing to take action to protect our most vulnerable Ontarians from COVID-19 and the Omicron variant, by offering a fourth dose (booster) of the COVID-19 vaccine to immunocompromised individuals three months (84 days) after they’ve completed their three-dose series.

Fourth doses are currently available after three months (84 days) following a third dose to residents of long-term care homes, retirement homes, elder care lodges, and other congregate settings that provide assisted living and health services.

Starting today at 8:00 a.m., immunocompromised Ontarians can schedule their fourth dose through the following channels:

by calling the Provincial Vaccine Contact Centre at 1-833-943-3900
directly through public health units that use their own booking system
at participating pharmacies
hospital clinics (visit your local hospital or public health unit for booking details, if available in your region)
mobile or pop-up clinics, such as the GO-VAXX bus (visit your local public health unit website for details, if available in your region)
through your hospital’s vaccination program if you are a hospital-based health care worker

Eligible individuals can include those who are:

a transplant recipient (including solid organ transplant and hematopoietic stem cell transplants)
receiving stable, active treatment (chemotherapy, targeted therapies, immunotherapy) for a malignant hematologic disorder or solid tumor
in receipt of chimeric antigen receptor (CAR)-T-cell
an individual with moderate or severe primary immunodeficiency (for example, DiGeorge syndrome, Wiskott-Aldrich syndrome)
Stage 3 or advanced untreated HIV infection and those with acquired immunodeficiency syndrome
undergoing active treatment with the following categories of immunosuppressive therapies: anti-B cell therapies (monoclonal antibodies targeting CD19, CD20 and CD22), high-dose systemic corticosteroids, alkylating agents, antimetabolites, or tumor-necrosis factor (TNF) inhibitors and other biologic agents that are significantly immunosuppressive or are taking specific immunosuppressant medications
receiving dialysis (hemodialysis or peritoneal dialysis)

Both Moderna and Pfizer vaccines provide strong protection against COVID-19 and the Omicron variant. It is safe to mix vaccines and the best vaccine for your booster is the first one available.