The Review
Third Dose Primary Series and Booster for Select Immunocompromised Individuals
Posted On: Monday, January 17, 2022
The Grey Bruce Health Unit is announcing the new provincial eligibility for a third dose series and fourth dose boosters for some individuals with select conditions.

In order to meet this eligibility, individuals must provide their prescription, prescription vial or a referral from a health care professional at the time of their appointment. The prescription or prescription bottle must match a medication within the list linked below. Only those with this information will be able to receive his or her vaccine.
For a detailed list of those eligible, please review the list provided here:
Some individuals who are immunocompromised can get:
- a third dose of the COVID-19 vaccine eight weeks after their second dose as part of an extended primary series
- a fourth dose (booster) three months (84 days) after completion of the three-dose primary series
Contact your health care provider to see if you are eligible.
You might be eligible if you 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 (PDF)
- receiving dialysis (hemodialysis or peritoneal dialysis)
Locally, appointments for a fourth dose (booster) can be booked:
Eligible individuals will need to provide their prescription, prescription vial or a referral from a health care professional at the time of their appointment.
For More Information:
Dr. Ian Arra, MD MSc FRCPC ACPM ABPM
Medical Officer of Health and Chief Executive Officer
To arrange to speak with Dr. Arra, please contact: communications@publichealthgreybruce.on.ca
519-376-9420 or 1-800-263-3456 ext. 3940
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