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Haemophilus influenzae type b (Hib)

Learn about Haemophilus influenzae type b, who is at risk, and how it spreads.

About Haemophilus influenzae type b

Haemophilus influenzae type b (Hib) is a bacteria that can cause meningitis, which is a serious infection of the fluid and lining of the brain and spinal cord, blood, or other parts of the body. Meningitis can lead to lifelong disabilities and death.

Hib is different from influenza (the flu). Hib does not cause influenza, and the vaccines that prevent Hib do not protect against influenza.

Who is most at risk?

You have a higher risk of serious infection if you:

  • are age 2 months to 2 years
  • have a weakened immune system
  • have no spleen or a spleen that isn’t working properly
  • have a cochlear implant

How it spreads

Hib spreads by coughing or sneezing. Some people don’t have symptoms but can still spread the disease.

Coughing

Sneezing

Current as of: August 31, 2026
Author: Communicable Disease Control, Primary Care Alberta
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