Hib infection is caused by a germ (or bacteria) called Haemophilus influenzae type b. It usually infects children under 5 years of age. Before Hib vaccine became available, Hib used to be the most common cause of bacterial meningitis in children aged 2 months to 5 years of age. Hib disease is now rare in BC because of routine childhood vaccination programs.
The majority of cases in children now occur in unvaccinated children or in children who are too young to have received their Hib vaccine at 2, 4, and 6 months of age.