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Influenza Immunization

Common Questions about Influenza Immunization

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​​​​​​​​​How is the influenza vaccine given?

The influenza vaccine is given by an injection.

Is the influenza vaccine safe?

Yes. In Canada, vaccines undergo laboratory and field-testing. They must pass a strict licensing procedure with the federal government before they can be used. Once a vaccine has been approved for use, every lot is tested for safety and quality. You can’t get influenza disease from the influenza vaccine.

If I was immunized last year, do I need to get immunized again this year?

Yes. You need to get influenza vaccine every year because influenza viruses change from year to year. It’s not unusual for new influenza viruses to appear each year. When viruses change, so do the vaccines. The World Health Organization identifies the strains of influenza that they predict will be the most common during the upcoming season. This information is used to develop the vaccine to protect against these strains. The immunity you get from your vaccine decreases over time, which means you need to get immunized every year to stay protected (even if you've been immunized against the same strain before).


To protect yourself against influenza, get immunized every year. Make it part of your fall routine.

I’m in Alberta, but I’m not an Alberta resident—can I get immunized?

If you live, work, or go to school in Alberta, you can get immunized for free at any of the Alberta Health Services influenza immunization clinics. For example, if you usually live in Nova Scotia but are working in Alberta, or you live in Ontario but are going to university in Alberta, you can get the vaccine for free. You can find an immunization clinic near you at Immunization Clinic Schedule.

If I’m healthy why do I need to get immunized?

Getting immunized is one of the best ways to prevent influenza. It’s a good idea for everyone in Alberta to get immunized, even healthy people not at risk of complications. If you have influenza, you can be sick for 5 to 10 days, but it can take weeks to fully recover. By protecting yourself, you help protect people around you who are at risk of complications from influenza. If more people are protected, less people will get sick from influenza.

I don’t normally get influenza—do I really need to get immunized?

It’s a good idea for everyone to get immunized for influenza every year. Influenza vaccine is the best way to decrease the chances that you will get influenza and spread it to others.

I had H1N1 disease/influenza disease before—do I still need to be immunized?

Even if you have had influenza disease (including H1N1) before, it is still important to get immunized every year. The strains circulating this year may be different than the one you had before.

I’m pregnant or breastfeeding—can I get immunized?

If you’re pregnant (or planning to get pregnant), it’s safe to get immunized with the inactivated influenza vaccine (injection). If you’re breastfeeding, it’s safe to get immunized with the inactivated in​fluenza vaccine (injection).

I have a latex allergy—can I get the vaccine?

If you have a latex allergy, it’s safe to get the vaccine. There is no latex in the vaccine, the packaging, or the syringe.

Can I get the vaccine if I take medicine?

Yes, it’s safe to get the inactivated vaccine (injection) if you take most types of medicine.

Can I get the vaccine at the same time as other vaccines?

Yes, the inactivated influenza vaccine (injection) can be given at the same time or any time before or after other inactivated or live vaccines.

Can I donate blood if I get the influenza vaccine?

If you get the inactivated influenza vaccine (injection), you have to wait 48 hours (2 days) before you can donate blood.

If you’ve donated blood, you don’t have to wait to get the influenza vaccine.

How long does it take for the vaccine to start working?

It takes about 2 weeks after getting the vaccine to be protected from influenza. You can be protected for up to 1 year. The vaccine won’t protect you from colds or other respiratory illnesses not caused by influenza.

How well does the vaccine work?

How well the influenza vaccine works can vary widely from season to season. It also depends on the age and health of the person being immunized. When the influenza strains in the vaccine are the same as the strains in the community, influenza illness can be prevented in healthy adults and older children.

Research shows that the vaccine can decrease:

  • complications in people that are high-risk
  • pneumonia, hospital admissions, and deaths in older adults
  • doctor appointments, hospital admissions, and deaths in high-risk people between 18 and 64

Current as of: October 4, 2019

Author: Influenza Immunization Program, Alberta Health Services​​