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COVID-19 vaccine dose recommendations

Anyone five years of age or older on the day of vaccination who lives, works or goes to school in Halton Region is recommended to get the COVID-19 vaccine.

COVID-19 vaccines continue to provide strong protection against getting seriously ill, having to go to the hospital, or dying from COVID-19. The protection you get from the vaccines may decrease over time. Evidence suggests booster dose(s) restore protection against the virus. Quickly calculate when you are recommended to get your next dose.

Primary Series

If you are… you should receive… with this recommended interval between doses…
5 years of age or older a 2-dose primary series 8 weeks (56 days)
5 years of age or older and moderately to severely immunocompromised a 3-dose primary series 8 weeks (56 days)

Booster Doses

After completion of the primary series (see above), it is recommended that some people receive one or two booster doses. Vaccines provided for booster doses are mRNA vaccines (Pfizer or Moderna) and can be a different vaccine than what you received for your previous doses. Halton Region Public Health is following provincial guidance for dosage amounts for booster doses (external PDF).

The number of booster doses recommended to you varies:

If you completed your primary series and are… you should receive… with this recommended interval between doses…
5 to 11 years old No boosters recommended at this time n/a
12 to 17 years old on the day of vaccination* a first booster 6 months (168 days) after completion of the primary series
18+ on the day of vaccination* a first booster 3 months (84 days) after completion of the primary series

Some individuals are recommended to get a second booster dose:

If you completed your primary series AND first booster and are… you should receive… with this recommended interval between doses…
a resident of a long-term care home, retirement home or a senior living in other congregate setting* a second booster 3 months (84 days) after the first booster
60+ (born in 1962 or earlier)* a second booster 5 months (140 days) after the first booster
First Nation, Inuit and Métis individuals 18+ & their non-Indigenous household members 18+ (must be 18 years of age or older on the day of vaccination)* a second booster 5 months (140 days) after the first booster

*this includes moderately to severely immunocompromised individuals who fall into one of the groups listed.

Find out where to get vaccinated.

Note: you may be able to receive a vaccine earlier than the recommended interval. If desired:

  • a second dose of a primary mRNA COVID-19 vaccine series can be received a minimum of 28 days after the first dose. Moderately to severely immunocompromised individuals can receive their third dose of a mRNA primary COVID-19 vaccine series a minimum of 28 days after their second dose (This minimum interval is for mRNA vaccine only).
  • a first booster dose can be received a minimum of 3 months (84 days) after completion of a primary COVID-19 vaccine series.
  • a second booster dose can be received a minimum of 3 months (84 days) after the first booster.

The National Advisory Committee on Immunization (NACI) recommends a longer interval between doses as it has been shown to result in a better immune response and somewhat better vaccine effectiveness than shorter intervals (external PDF).

Have questions about COVID-19 vaccines? Visit our Frequently Asked Questions about COVID-19 vaccination webpage. For more information for children 5-11 years of age, visit halton.ca/COVIDvaccines4kids.

More Information

For a full list of eligible individuals in this group, visit the Province's Getting the COVID-19 vaccine webpage (external link).

Eligible individuals in this group must present with one of the following at a vaccination clinic:

  • A completed referral form (PDF file) from their health care practitioner (or physician note with equivalent information to the referral form); or
  • A current medication bottle, prescription, or receipt for a medication listed in COVID-19 Vaccine Third Dose Recommendations (external PDF), Table 1: List of Immunosuppressant Medications for Third Doses.
    • The prescription or medication bottle must include the:
      • client’s first and last name (must match piece of identification); and
      • address and telephone number of the pharmacy that filled the prescription.
    • The prescription must have been prescribed or refilled within the past 6 months.
    • Active treatment with B-cell depleting therapies (monoclonal antibodies targeting CD19, CD20 and CD22) must have been completed within the last 12 months.

View a list of all eligible congregate care settings in Halton region (PDF file).

Halton Region Public Health will contact eligible facilities to arrange for vaccination of their residents. For more information, residents of congregate settings can speak with their Director of Care or Administrator. Mobile clinics may offer Pfizer or Moderna vaccine, depending on supply.

Eligible residents can also book an appointment at a Halton Region Community COVID-19 Vaccination clinic. To receive a second booster dose, residents will need to provide proof of living in an eligible congregate settings. This can include a driver’s license or a letter (on letterhead) from the congregate care facility.

Vaccination timing for individuals who previously had a COVID-19 infection

Vaccination is very important, even if you have been previously infected with COVID-19. While infection alone provides some protection, vaccination after infection helps improve the immune response and may provide better and longer-lasting protection against current and future variants of the virus.

When you should get your next dose of vaccine depends on when you had COVID-19.

If you are five years of age or older and have COVID-19 before starting or completing your primary COVID-19 vaccine series*, get your next dose:

  • eight weeks after your COVID-19 symptoms started; or
  • eight weeks after you tested positive if you did not experience symptoms.

If you are 12 years of age or older and had COVID-19 after completing your primary COVID-19 vaccine series* and before getting a booster dose, get your next dose:

  • three months after symptoms started; or
  • three months after you tested positive.
  • Note: if you are 12 to 17 years of age, this must be at least six months after completing your primary series.

Additional guidance on intervals between infection and vaccination for individuals who are moderately to severely immunocompromised, or children who have experienced multisystem inflammatory syndrome in children (MIS-C), are outlined in NACI’s updated guidance (external PDF).

Emerging evidence indicates that a longer interval between infection and vaccination is recommended since it may result in a better immune response and longer-lasting protection against Omicron and future variants. However, with informed consent, individuals may receive the COVID-19 vaccine once they are feeling well (have no COVID-19 symptoms) and have completed their isolation. All post-COVID-19 infection vaccinations must follow the minimum dose interval suggested for your age and eligibility category.

Guidance on suggested intervals between infection and vaccination may change as additional evidence emerges.

* For most people in Canada, a “complete primary series” is two doses of either Pfizer, Moderna or AstraZeneca vaccine. Some individuals, including those who are immunocompromised, require three doses of COVID-19 vaccine.

Individuals who received non-Health Canada approved COVID-19 vaccines

Individuals who received a non-Health Canada approved COVID-19 vaccine* may be eligible to receive additional doses:

  • If you have proof of vaccination and received one or two-doses of a COVID-19 vaccine not authorized for use by Health Canada, you will be offered one additional dose of an mRNA vaccine to be considered fully vaccinated in Ontario (external PDF). The additional mRNA dose can be received at a minimum of 28 days after the previous dose.
    • You are also recommended to receive a booster dose of a Health Canada authorized vaccine:
      • 3 months (84 days) after your last dose, if aged 18+
      • 6 months (168 days) after your last dose, if aged 12-17
  • If you have proof of vaccination and received three doses of a non-Health Canada authorized COVID-19 vaccine at the appropriate interval you are considered fully vaccinated in Ontario (external PDF).
    • You are also recommended to receive a booster dose of a Health Canada authorized vaccine:
      • 3 months (84 days) after your last dose, if aged 18+
      • 6 months (168 days) after your last dose, if aged 12-17

This guidance is subject to change.

Please bring your COVID-19 vaccination records with you to get your COVID-19 vaccine. The COVID-19 vaccination records must be in English, or you must have a certified translation into English.

* Health Canada has approved the following COVID-19 vaccines (external link): AstraZeneca, Pfizer-BioNTech, Moderna, Janssen, Novavax, and Medicago.

Report an out-of-province COVID-19 vaccination

Report an out-of-province COVID-19 vaccination

If you live in Halton and received a COVID-19 vaccine outside of Ontario or Canada, report this information to Halton Region Public Health. This information must be verified before you can access your vaccine certificate with a QR code. This does not need to be completed before you get your COVID-19 vaccine. The information you submit will be assessed within three weeks and, if needed, you will receive further instructions by email.

To learn about where to get your vaccine, refer to the COVID-19 Vaccination Clinics and Vaccine Information webpage.

Find out when it is recommended to get your next dose

Use this calculator to determine when you should get your next dose. This dose calculator is based on the recommended intervals between doses. Please choose your eligibility group, enter the date of your last dose, and then select “Calculate Date”. Check if you are eligible for a booster dose. Your eligibility will assessed at clinic.



Error: Please ensure both fields have been filled in:

placeholderText: Based on the information you provided this is the earliest date you are recommended to get your next dose. If you had a recent COVID-19 infection this may affect when you are recommended to get your dose. Learn more about the vaccination timing for individuals who previously had a COVID-19 infection. Learn where to get vaccinated.

Find out where you can get your COVID-19 vaccine.

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