Details about first, second, third and booster doses of the COVID-19 vaccine.
Third and booster doses
Even though 2 doses provides strong protection against infection and severe illness, there is now evidence that shows that getting a third or booster dose will help you keep up your full level of protection against COVID-19.
Select groups are currently eligible to receive a third or booster dose.
Refer to the following information for details about vaccine doses.
It's essential that you complete your vaccine series by receiving all required doses of the COVID-19 vaccine.
Get your vaccine
There are many ways you can get your vaccine. Peel Public Health vaccine clinics, pop-up clinics, participating pharmacies, doctor's offices, and walk-in clinics are all offering the first and second doses. Find a vaccine location.
Anyone born in 2009 or older can get the vaccine. Youth 12 to 17 years of age will receive the Comirnaty (Pfizer) vaccine. The Ontario government has recommended that, for individuals between the ages of 18 and 24, it's preferred that they receive Comirnaty (Pfizer-BioNTech).
Children 5 to 11 years old
The Comirnaty (Pfizer-BioNTech) vaccine has been authorized for use in children 5 to 11 years old. This vaccine is different than the vaccine authorized for use in individuals 12 years or older. Learn more about the vaccine for children 5 to 11 years old.
Refer to COVID-19 vaccines for children including providing consent, and helping your child prepare for the appointment.
In Canada, the National Advisory Committee on Immunization (NACI) has advised that, based on current scientific evidence and expert opinion, mixing different vaccines is safe and effective to protect against COVID-19. Based on this, in Ontario, you are now allowed to receive a different type of COVID-19 vaccine for your first and second doses, to complete your vaccination series.
Comirnaty (Pfizer-BioNTech) or Spikevax (Moderna)
Anyone who received the mRNA vaccines Comirnaty (Pfizer-BioNTech) or Spikevax (Moderna) is eligible to get their second dose.
In Ontario, the recommended time between the first and second dose of the vaccine is at least 8 weeks.
If you received your first dose of Vaxzevria (AstraZeneca) at least 8 weeks ago you can book your second dose. You can get a second dose of either Spikevax (Moderna) or Comirnaty (Pfizer-BioNTech).
The following groups are eligible to receive a booster dose if it has been at least 3 months (84 days) after your second dose.
- Adults 18 years or older. You must be 18 years old on the day you receive your vaccine.
- Designated essential caregivers in congregate settings, including long-term care home and retirement home staff, and designated caregivers (16 years or older).
- First Nations, Inuit and Métis adults and their non-Indigenous household members (16 years or older).
- Anyone who received a complete series of a viral vector vaccine (2 doses of the Vaxzevria (AstraZeneca) vaccine or 1 dose of the Janssen vaccine).
Adults 70 years or older will receive a full dose of Moderna for their booster. You can be 69 (turning 70 in 2022) at the time of your vaccine appointment.
How to get a booster dose
You must book an appointment for a booster dose, as walk-in appointments are reserved for residents coming in for their first or second doses.
You can book an appointment:
- Through the COVID-19 vaccine booking system or by calling 1-833-943-3900 (TTY 1-866-797-0007).
- Book an appointment online at a school vaccine clinic
Walk-in appointments are not available for booster doses.
You can also get your booster dose through select pharmacies, doctor's offices, and walk-in clinics.
Make sure you book your appointment for a date that is at least 3 months (84 days) after you received your second dose. If you come to the clinic with an appointment booked too early you will not receive the vaccine.
Seniors 65 years of age and older living in the following settings will receive their booster dose in their residence or group setting:
- Long-term care and retirement homes
- Elder care lodges
- Other congregate settings
How to get your booster dose
Peel Public Health is actively working with Peel group settings to administer booster doses. This means you will be offered your booster dose at the residence or group setting where you live.
You cannot get a booster dose at Peel Public Health vaccine clinics, pop-up clinics, pharmacies, doctor's offices, or walk-in clinics.
The following immunocompromised individuals are eligible for a third dose, if it has been at least 2 months (or 8 weeks) after the second dose:
- Individuals receiving active treatment (chemotherapy, targeted therapies, immunotherapy) for solid tumour or hematologic malignancies.
- Individuals receiving dialysis (hemodialysis or peritoneal dialysis).
- Recipients of solid-organ transplant and taking immunosuppressive therapy.
- Recipients of chimeric antigen receptor (CAR)-T-cell therapy or hematopoietic stem cell transplant (within 2 years of transplantation or taking immunosuppression therapy).
- Recipients post-transplantation for hematopoietic stem cell transplant (HSCT), hematopoietic cell transplants (HCT) (autologous or allogeneic), and recipients of chimeric antigen receptor (CAR)-T-cell therapy.
- Individuals with moderate to severe primary immunodeficiency (e.g., DiGeorge syndrome, Wiskott-Aldrich syndrome).
- Individuals with stage 3 or advanced untreated HIV infection and those with acquired immunodeficiency syndrome.
- Individuals receiving active treatment with the following categories of immunosuppressive therapies: anti-B cell therapies2 (monoclonal antibodies targeting CD19, CD20 and CD22), high-dose systemic corticosteroids (refer to the CIG for suggested definition of high dose steroids), alkylating agents, antimetabolites, or tumor-necrosis factor (TNF) inhibitors and other biologic agents that are significantly immunosuppressive.
How to get your third dose
You can receive a third dose at the following locations:
Region of Peel main office
10 Peel Centre Drive, Brampton
Tuesday to Saturday, 1 to 8 p.m.
Region of Peel Mississauga office
7120 Hurontario Street, Mississauga
Tuesday to Saturday, 1 to 8 p.m.
Caledon East Community Complex
6215 Old Church Road, Caledon East
Sunday to Thursday, 1 to 8 p.m.
Embassy Grand vaccination centre
8800 The Gore Rd., Brampton
Monday to Thursday 12 to 8 p.m.
Friday to Sunday 10 a.m. to 6 p.m.
Find a location
Immunocompromised individuals must bring 1 of the following to a clinic or pharmacy to receive your third dose:
- Third dose referral form completed by doctor or nurse practitioner.
- Current prescription package, label, or pharmacy receipt of an immunosuppressant medication listed by the Ontario government. The prescription must clearly label:
- Patient name
- Name of medication
- Date of dispensing
- Name of prescribing doctor
If you have a prescription for an immunosuppressant medication not listed by the Ontario government, you can contact your doctor or health care provider to receive a referral form for a third dose of the COVID-19 vaccine.
Booking a fourth dose
If you’re eligible for a fourth dose you can book your appointment by calling Ontario's vaccine booking line at 1-833-943-3900 (TTY 1-866-797-0007). Appointments cannot be booked online at this time.
Refer to Appendix B for a full list of health care workers eligible for a booster dose.
Hospital-based health care workers can find out from their employer if they can get vaccinated through their hospital's vaccination program.
Other health care workers will be asked to provide either an employee letter, an employee badge or ID at the time of vaccination.