ETIOLOGY OF BACTERIAL MENINGITIS BY PREDISPOSING CONDITION Immunocompromised state: S pneumoniae, N. meningitidis Listeria, aerobic gnr Basilar skull fracture: S pneumoniae, H influenzae, beta- hemolytic strep group a Head trauma or post-neurosurgery: S aureus, S epidermidis aerobic gnr CSF shunt: S epidermidis, S aureus, aerobic GNR, Propionibacterium acnesETIOLOGY OF BACTERIAL MENINGITIS BY PREDISPOSING CONDITION Immunocompromised state: S. pneumoniae, N. meningitidis, Listeria, aerobic GNR Basilar skull fracture: S. pneumoniae, H. influenzae, beta￾hemolytic strep group A Head trauma or post-neurosurgery: S. aureus, S. epidermidis, aerobic GNR CSF shunt: S. epidermidis, S. aureus, aerobic GNR, Propionibacterium acnes