Vaccination is the best protection against meningococcal serogroup C infections and their complications. For instance, meningitis that is an infection of the brain lining and meningococcemia that is an infection of the blood are 2 serious infections caused by serogroup C meningococcus

There are different serogroups or types of meningococcus, among other serogroups A, B, C, W and Y. This vaccine protects against serogroup C.

Since June 1, 2019, Québec’s immunization schedule has provided for the administration of one dose of the meningococcal serogroup C vaccine at 18 months of age, replacing the dose previously given at 12 months. A 2nd dose of the vaccine is still given in Secondary 3.


Some symptoms may be caused by the vaccine, e.g. redness at the injection site. Other problems may occur by chance and are not related to the vaccine. e.g. cold, gastro, headache.

Meningococcal serogroup C conjugate vaccine is safe. Most reactions are harmless and do not last long.

The Nature and Frequency of Possible Reactions to Vaccine
FréquenceRéactions possibles au vaccin

In most cases
(more than 50% of people)

  • Pain at the injection site

Very often
(less than 50% of people)

  • Redness and swelling at the infection site
  • Fever, drowsiness (sleepiness) and irritability, especially among children under 5
  • Headache, discomfort, muscle pain and joint pain especially in people age 11 or older.
  • Loss of appetite, nausea, vomiting, diarrhea

What to do after vaccination

Tips to follow immediately following vaccination

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

If you experience redness, pain or swelling at the injection site, apply a cold, damp compress on it.

Use medication for fever or discomfort if needed.

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