COVID-19 vaccines: getting your second dose

Learn when and where you will be eligible to book an appointment for your second dose of the covid 19 vaccines.

This page will be updated regularly. Last updated: June 23, 2021

You will receive an mRNA vaccine (either Moderna or Pfizer) at the clinic depending on supplies and age eligibility. If you had Moderna or Pfizer for your first dose you can safely take either Moderna or Pfizer for your second dose for strong protection against covid 19. If you had AstraZeneca for your first dose you can safely take either Moderna, Pfizer or AstraZeneca for your second dose for strong protection.

Accelerating second doses

A stable and reliable supply of covid 19 vaccines has allowed the province to quickly expand eligibility and access to Ontarians to receive the vaccine ahead of schedule, providing a strong level of protection against the virus.

Ontario is now accelerating second doses for eligible Ontarians.

Your appointment for your accelerated second dose must be at least:

  • 8 weeks after your first dose of AstraZeneca with informed consent
  • 28 days after your first dose of Moderna or Pfizer

Timing of second dose appointments may vary based on local considerations, vaccine supply and the date of your first dose appointment. Learn when you can book an appointment.

Which vaccine you can get

All Health Canada approved vaccines provide strong protection against covid 19 and its variants, including the Delta variant.

Vaccines can be safely mixed for a first and second dose. To ensure maximum protection, you are encouraged to get vaccinated as soon as you can and to receive your second dose within the recommended interval.

If your first dose was:

  • AstraZeneca: you can get AstraZeneca, Moderna, or Pfizer for your second dose when you are eligible and it’s at least 8 weeks after your first dose with informed consent.
  • Moderna or Pfizer: you can get either Moderna or Pfizer when you are eligible and it’s at least 28 days after your first dose. You can switch between Moderna and Pfizer safely.

All of these options for your second dose:

  • are safe
  • provide strong protection against covid 19, including the Delta variant
  • will count as a completed series (you will be fully vaccinated)

For more information, read our safe and effective second dose fact sheet.

When you can book an appointment

Second dose appointments will be based on the timing of your first dose, on a “first-in, first-out” basis.

If your first dose was Pfizer or Moderna

You can get your accelerated second dose according to the following schedule, as long as it’s been at least 28 days since your first dose.

Starting date Who is eligible
May 31 People aged 80 and over

People aged 70 and over (in pharmacies or primary care settings only)

Adults age 18 or older who received their first dose on or before April 18 (in pharmacies or primary care settings only)
June 7 People aged 70 and over (through the provincial booking system)

Adults age 18 or older who received their first dose on or before April 18 (through the provincial booking system)
June 14 Adults age 18 or older who received their first dose on or before May 9 and live in Halton, Peel, Porcupine, Toronto, Waterloo, Wellington-Dufferin-Guelph or York public health units
June 21 Adults age 18 or older who received their first dose on or before May 9 in all other public health units
June 23 Adults age 18 or older who received their first dose on or before May 30 and live in Durham, Halton, Hamilton, Peel, Porcupine, Simcoe-Muskoka, Toronto, Waterloo, Wellington-Dufferin-Guelph or York public health units
June 26 Youth age 12 to 17 who live in Durham, Halton, Hamilton, Peel, Porcupine, Simcoe-Muskoka, Toronto, Waterloo, Wellington-Dufferin-Guelph and York public health units
June 28 All remaining adults age 18 and older who have received their first dose (anyone who received their first dose on or after June 28 will be eligible to book an accelerated second dose)
July 5 All remaining youth age 12 to 17 in all other public health units

If your first dose was AstraZeneca

If your first dose was the AstraZeneca vaccine, for your second dose you can choose to receive either:

  • a second dose of AstraZeneca
  • one of the mRNA vaccines (Pfizer or Moderna)

You can get a second dose of AstraZeneca:

  • at least 8 weeks after your first dose with informed consent
  • at a participating pharmacy or primary care setting

You can book one of the mRNA vaccines:

  • at least 8 weeks after your first dose of AstraZeneca with informed consent
  • through:
    • the provincial booking system
    • a participating pharmacy or primary care setting
    • public health units that use their own booking system

Shortened second dose intervals for high-risk health care workers, individuals with certain health conditions and First Nations, Inuit and Metis individuals

Certain groups who face a greater risk of contracting and suffering serious illness from covid 19 can also get their second dose at a shorter interval for additional protection.

You may be able to get your second dose earlier than four months after your first one if you:

  • live in a:
    • long-term care home
    • retirement home
    • Elder Care Lodge
    • assisted living facilities
  • had an organ or stem cell transplant
  • are being treated for cancer that affects your blood, bone marrow or lymph nodes (a haematological malignancy) or a malignant solid tumor
  • are a dialysis patient
  • are taking certain immunosuppressive medications (anti-CD20 agents, such as rituximab, ocrelizumab or ofatumumab)
  • are a high-risk health care worker
  • identify as First Nations, Inuit or Métis, (including non-Indigenous partners, immediate household members and adolescents aged 12-17)

Where to get it and how to book an appointment

When you are eligible for an accelerated second dose, you may book at the same place you got your first dose or you can book it at a different site or channel (even if you already have a second appointment booked).

Not all clinic types are available in every region and depend on local planning done by each public health unit.

Please do not try to book an appointment before you are eligible.

Mass immunization clinic

In most cases, if you booked your first dose at a mass immunization clinic, your second dose was automatically scheduled 16 weeks after your first.

You can rebook your appointment:

Second doses can also be booked without a first appointment through the provincial booking system.

Pop-up or mobile clinic

If you already have an appointment booked at the pop-up location where you received your first dose, you will also have the option of booking a second dose at another mobile clinic or through another channel.

More information will follow on how and when second dose booking and rebooking will be available.

Hospital clinic

Visit your local hospital or public health unit website for booking details, if available in your region.

Pharmacy or primary care provider

You are encouraged to contact the pharmacy or primary care provider where you received your first dose. You may also find a different participating pharmacy to book an appointment, when you are eligible.

Primary care settings and pharmacies may also be reaching out to eligible Ontarians to accelerate appointments for second doses.

If you were vaccinated outside Ontario or Canada

If you received your first dose or both doses of the covid 19 vaccine outside of Ontario or Canada, you can register your vaccination by contacting your local public health unit (PHU).

If you received only your first dose, you must:

  • provide proof, such as an immunization record or a proof of vaccination certificate to your PHU to be registered in the system
  • book your second dose through:

Your second dose appointment will be booked with the appropriate second dose interval.

If you received both doses, you only have to provide proof of vaccination to your PHU. No other action is needed.

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