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COVID-19 Vaccine Eligibility and Recommendations



  • Get boosted this fall! Everyone 12+ can now walk-in or book an appointment to get the bivalent COVID-19 booster dose.
    • The bivalent booster targets the original COVID-19 virus and the Omicron variant, and can help restore protection that has decreased since previous vaccination.

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When can I get my next dose?

Use our calculator to quickly find out when you can get your next dose.

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Booster doses

The protection you get from the vaccines may decrease over time.

Evidence suggests booster dose(s) restore protection against the virus. Even after a COVID-19 infection, vaccination helps improve the immune response and may provide better and longer-lasting protection. To be eligible for a booster dose you must first complete your primary series.

Complete the online Booster Dose Eligibility Checker (external link) to find out when you should get your next dose. Most people under the age of 65 are recommended to get their booster dose six months after their last dose or following a COVID-19 infection.

People over the age of 65 and people at higher risk of severe COVID-19 illness are strongly recommended to get their booster dose at a three-month interval, as we enter the fall/winter respiratory illness season.

There are currently two types of booster doses available:

Monovalent boosters

Individuals 5-11 years of age are able to get a booster dose of the monovalent mRNA COVID-19 vaccine. This type of vaccine protects against the original COVID-19 strain.

Bivalent boosters

Anyone 12 years of age and older can get the bivalent COVID-19 booster dose.

A bivalent vaccine combines two types of vaccine—one that targets the original COVID-19 strain along with a second that targets the Omicron variant which is currently the dominant variant in circulation in Ontario.

All residents will receive an age-appropriate Health Canada approved vaccine. There is no preferential recommendation between Moderna bivalent COVID-19 boosters or Pfizer bivalent COVID-19 boosters for individuals 18 years of age and older. Halton region COVID-19 community vaccination clinics offer the Pfizer bivalent COVID-19 booster dose for all those who are eligible, depending on supply.

Primary series

The primary series is the initial doses required to develop a strong immune response. Anyone six months of age or older on the day of vaccination is recommended to get the COVID-19 vaccine. Learn where you can get vaccinated.

The vaccines provided for primary series at Halton Region COVID-19 vaccination clinics are monovalent mRNA COVID-19 vaccines (Pfizer or Moderna, depending on supply and the person’s age). Learn more about the types of COVID-19 vaccines available.

Two-dose primary series:

For most people, a primary series is two doses of a COVID-19 vaccine, at a recommended interval of eight weeks (or 56 days) apart. If you had a recent COVID-19 infection*, get your second dose eight weeks (or 56 days) after your COVID-19 symptoms started or you tested positive.

*a previous infection is defined as:

  • Confirmed by a molecular (e.g. PCR) or rapid antigetn test, or;
  • Symptomatic AND a household contact of a confirmed COVID-19 case.

Three-dose primary series:

For some people, a primary series is three doses of a COVID-19 vaccine.

Anyone six months or older who are moderately to severely immunocompromised (external link) are recommended to get a third dose to complete their primary series, as early as eight weeks (56 days) after their second dose.

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.

Individuals who received two doses of a non-Health Canada authorized COVID-19 vaccine may receive a third dose to complete their primary series. Learn more about recommendations for individuals who received non-Health Canada authorized COVID-19 vaccines.

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

Individuals who received a COVID-19 vaccine not authorized by Health Canada (HC)* (for example, while in another country) may need additional doses to stay up-to-date:

  • People who received only one or two doses of a non-HC authorized COVID-19 vaccine may receive one additional dose in Ontario at least 28 days after the previous dose to complete the primary series.
  • People who received one HC authorized vaccine and one non-HC authorized vaccine (in either order) need no additional doses to complete the primary series.
  • People who received three doses (any combination of HC authorized, and non-HC authorized) need no additional doses to complete the primary series.

Following any additional doses needed to complete the primary series, these individuals should follow the relevant age-based booster dose recommendations.

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

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. The information you submit will be assessed within three weeks and, if needed, you will receive further instructions by email.

How to get a COVID-19 booster dose if you are eligible:

1) Visit a Halton Region COVID-19 Vaccination clinic - Bring your original vaccination records with you to a Halton Region COVID-vaccination clinic. You do not need to report your vaccination records before getting a booster dose at a Halton Region COVID-19 vaccination clinic.

2) Visit a pharmacy, primary health care provider or other vaccination clinic – Before attending a pharmacy or primary care provider to get your COVID-19 vaccine, you must first report any out-of-province vaccination records for your primary series using the button below. After you receive confirmation that your records have been verified, you can get your COVID-19 vaccine at any participating local pharmacy, primary care office or other vaccination clinic. Find locations offering the COVID-19 vaccine on the COVID-19 Vaccination Clinics and Vaccine Information webpage.

Report your out-of-province COVID-19 vaccination records

Find out when you can get your next dose

Use this calculator to determine when you can get your next dose.

  • Primary Series: This calculator uses the recommended interval of eight weeks (or 56 days) between doses in your primary series.
  • Booster Doses: This calculator uses the minimum interval of three months. Get your booster dose three to six months after completing your last dose of COVID-19 vaccine (including monovalent boosters) or having a COVID-19 infection.

Please choose your dose from the dropdown menu, enter the date of your last dose or COVID-19 infection (whichever was most recent), and then select “Calculate Date”.

Error: Please ensure both fields have been filled in:

placeholderText: Based on the information you provided this is the earliest date you can get your next dose. Appointments at Halton Region Community Clinics are currently available until December 23, 2022. Please check back regularly as appointments are added. Find out where you can get vaccinated in Halton.

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

  • a second or third dose of a primary mRNA COVID-19 vaccine series can be received a minimum of 28 days after the last dose (this minimum interval is for mRNA vaccine only). (NOTE: Halton region Paediatric clinics require a minimum interval of 56 days for children six months to 11 years of age)

  • a booster dose can be received a minimum of 3 months (84 days) after completion of a primary COVID-19 vaccine series.

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