ETIOLOGY OF BACTERIAL MENINGITIS BY AGE <1 month Streptococcus agalactiae, Escherichia coli, listeria monocytogenes Klebsiella species 1-23 mos Streptococcus pneumoniae, Neisseria meningitidis, S agalactiae, Haemophilus influenzae, e coli 2-50 yrs N. meningitidis, S pneumoniae >50 yrs S pneumoniae, N. meningitidis, L. monocytogenes gram-negative bacilli<1 month Streptococcus agalactiae, Escherichia coli, Listeria monocytogenes, Klebsiella species 1 - 23 mos Streptococcus pneumoniae, Neisseria meningitidis, S. agalactiae, Haemophilus influenzae, E. coli 2 - 50 yrs N . meningitidis, S. pneumoniae >50 yrs S.pneumoniae, N. meningitidis, L. monocytogenes, gram-negative bacilli ETIOLOGY OF BACTERIAL MENINGITIS BY AGE