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COVID-19 vaccine – mRNA

Learn about the COVID-19 mRNA vaccine, doses, side effects, and safety.

COVID-19 mRNA vaccines

COVID-19 vaccines help protect you from getting very sick from COVID-19 and needing care in the hospital.

The Moderna Spikevax XFG and Pfizer-BioNTech Comirnaty XFG vaccines are approved by Health Canada. They are updated mRNA vaccines that help protect you against the COVID-19 strains that are currently spreading.

Who can get this vaccine

Albertans at high risk

COVID-19 vaccine is available free of charge for:

  • People age 65 years and older.
  • People age 6 months to 64 years who are at higher risk of severe illness or more likely to be exposed to COVID-19 and spread it to others.

Visit Respiratory virus season – Get vaccinated for details about COVID-19 vaccine eligibility.

All other Albertans

All other Albertans age 12 to 64 years who cannot get COVID-19 vaccine free of charge can purchase it at a participating pharmacy.

For children under age 12 years, COVID-19 vaccines are only available at public health or community health centres. Children under age 12 years cannot get the COVID-19 vaccine at a pharmacy. If your child is age 6 months to 11 years and is not eligible for COVID-19 vaccine free of charge, you can purchase the vaccine at your local public health or community health centre. There is a $100 administrative cost. An invoice will be mailed to you and will also be available in MyChart within 5 to 10 business days.

Who may not be able to get this vaccine

You may not be able to get an mRNA COVID-19 vaccine if:

  • You have an allergy to any part of the vaccine. Be sure to tell your healthcare provider about any allergies you may have.
  • You had a severe (serious) or unusual side effect after this vaccine or one like it.

If either of those apply, check with your healthcare provider before you get the vaccine.

The mRNA COVID-19 vaccine is not approved for babies under age 6 months.

Although you can get the vaccine if you have a mild illness such as a cold or fever, it’s best to stay home until you feel better. This helps prevent spreading your illness to others.

Be sure to talk to your healthcare provider to find out when to get an mRNA COVID-19 vaccine if:

  • You have a history of multisystem inflammatory syndrome as a child (MIS-C) or an adult (MIS-A).
  • You have a weakened immune system (because of medicine you take or a health problem).
  • You have had a stem cell or organ transplant.
  • You are getting CAR T-cell therapy (a type of cancer treatment).
  • You have a history of myocarditis, pericarditis, or both within 6 weeks of getting a dose of COVID-19 vaccine.

Already had COVID-19

If you have already had COVID-19, it is not yet known how long your protection will last or how much protection you will have against variants. It is important to get a COVID-19 vaccine even if you have already had the virus.

If you had COVID-19, you can get the vaccine once you are no longer sick and are feeling better.

If you developed multisystem inflammatory syndrome (MIS-C or MIS-A) after having COVID-19, check with your healthcare provider about when to get a COVID-19 vaccine.

Pregnancy and breastfeeding/
chestfeeding

While you are pregnant, you have a higher risk of getting very sick from COVID-19. Getting a COVID-19 vaccine lowers your risk of getting seriously ill from the virus.

You can get an mRNA COVID-19 vaccine if you are pregnant or breastfeeding/chestfeeding. There have been no safety concerns with receiving a COVID-19 vaccine while pregnant or breastfeeding/chestfeeding.

If you are pregnant or breastfeeding/chestfeeding and have questions about getting a COVID-19 vaccine, talk to your healthcare provider.

Vaccines

If you are age 6 months to 11 years, you can get the Moderna vaccine.

If you are age 12 years and older, you can get either the Moderna or the Pfizer-BioNTech vaccine, depending on vaccine availability.

Doses

COVID-19 vaccine recommendations, including how many doses to get, depend on your age and your immune system. Talk with your healthcare provider about what is right for you.

Off-label use

“Off-label use” means the vaccine is used differently than the way it was originally approved. Vaccine experts support the following off-label uses for XFG mRNA COVID-19 vaccines and have no safety concerns:

  • Adults with a healthy immune system and children age 5 years or older who get a dose of Moderna XFG vaccine sooner than 6 months after the last dose.
  • Adults with a weakened immune system who get a second dose of Moderna XFG vaccine sooner than 2 months after their first dose.
  • Adults with a weakened immune system who have already had 2 or more doses of a COVID-19 vaccine and get the Moderna vaccine sooner than 4 months after the last dose.
  • Adults and children age 12 years or older who get a dose of Pfizer-BioNTech XFG vaccine sooner than 6 months after the last dose.
  • Adults and children age 5 years or older who get more than 1 dose of an XFG vaccine.
  • Children age 6 months to 4 years who have had one or more COVID-19 vaccines in the past and get more than 1 dose of XFG vaccine.
  • Children age 6 months to 4 years who have never had COVID-19 vaccine and get more than 2 doses of XFG vaccines.
  • Children age 6 months to 4 years who get a second dose sooner than 8 weeks from their first dose.
  • Children age 6 months to 4 years who have already had 2 or more doses of a non-XFG vaccine and get a dose of an XFG vaccine sooner than 6 months after the last dose.

Consent for immunization

A parent or guardian must provide verbal or written consent for a child under age 18 years to get a COVID-19 vaccine.

If a parent or guardian cannot be at the appointment, written consent must be provided. They can give consent in writing using the consent form at COVID-19 consent for children under 18.

In some cases, children under age 18 years may be able to give their own consent.

Alternate decision-makers (such as an agent, guardian, specific decision-maker, or co-decision-maker for another person) can use the consent form when they can't attend an immunization appointment with the person they represent. They must also provide documents that show they are the authorized decision-maker.

The person being immunized must have the completed and signed consent form with them at their appointment.

Current as of: September 28, 2026
Author: Communicable Disease Control, Primary Care Alberta
Our work takes place on historical and contemporary Indigenous lands, including the territories of Treaty 6, Treaty 7 & Treaty 8 and the homeland of the Métis Nation of Alberta and 8 Métis Settlements. We also acknowledge the many Indigenous communities that have been forged in urban centres across Alberta.