Figure 2. Distribution of bacteria causing childhood acute bacterial meningitis in different age groups. Neisseria meningitidis was the most common cause of meningitis, and the highest estimated incidence was in children <1 year of age for all 3 bacteria. The number of cases is indicated above each bar. S. pneumoniae, Streptococcus pneumoniae; Hib, Haemophilus influenzae type b.