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Intranasal flu vaccine

General notice

If you have a fever or any other symptoms of COVID-19, you must postpone getting vaccinated.


Vaccination is the best protection against the flu and its complications. The flu vaccine does not protect against the common cold and respiratory infections caused by other viruses, such as COVID-19.

The intranasal flu vaccine is given via a nasal spray, one squirt in each nostril. In most cases, this type of vaccine can be administered even in the presence of nasal discharge.

People aged 2 to 59 can receive the intranasal vaccine unless otherwise contraindicated.

For a child younger than 9 years, 2 doses of the vaccine, given 1 month apart, are required when it is a first vaccination against the flu.

As the virus contained in the vaccine may be found in nose secretions, avoid close contact with severely immunosuppressed people requiring protective isolation, for 2 weeks following vaccination.

For the 2022-2023 season, the intranasal vaccine contains the following strains:

  • A/Victoria/2570/2019 (H1N1)
  • A/Darwin/9/2021 (H3N2)
  • B/Austria/1359417/2021 B/Victoria lineage
  • B/Phuket/3073/2013 B/Yamagata lineage

The intranasal flu vaccine is not offered under the Flu Vaccination Program.

Symptoms after vaccination

Some symptoms may be caused by the vaccine. Other problems may occur by chance and are not related to the vaccine, such as cold, gastro or headache.

The intranasal flu vaccine is safe. In most cases, it does not cause any reaction.

The Nature and Frequency of Known Reactions to this Vaccine
FrequencyKnown Reactions to the Vaccine

(less than 10% of people)

  • Runny nose or nasal congestion
  • Headache
  • Fatigue or discomfort


(less than 1 person in 1,000)

  • Allergic reaction

What to do after vaccination

Tips to follow immediately after receiving vaccine

Wait 15 minutes before leaving premises where vaccine is received. If an allergic reaction occurs, the symptoms will appear a few minutes after the vaccination.

If you feel side effects, immediately inform the person giving the vaccine. That person will be able to treat you immediately.

Tips to follow at home

Use medication for fever or discomfort if needed.

Do not give medication containing acetylsalicylic acid (aspirin) to people under 18 years of age in the 4 weeks following their vaccination.

When to seek medical help

See a doctor if one of the following applies to you:

  • You experience serious and unusual symptoms
  • Your symptoms get worse instead of improving
  • Your symptoms last over 48 hours

Last update: October 24, 2022


Information on the website in no way replaces the opinion of a health professional. If you have questions concerning your health status, consult a professional.


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