Common Organisms by Patient Population in Bacterial Meningitis 

Updated: Feb 18, 2016
  • Author: Shingo Chihara, MD; Chief Editor: Michael Stuart Bronze, MD  more...
  • Print
Sections

Bacterial Pathogens and Risk/Predisposing Factors

Table. Bacterial Pathogens and Risk or Predisposing Factors [1, 2] (Open Table in a new window)

Risk and/or Predisposing Factor Bacterial Pathogen
Age 18-50 y Streptococcus pneumoniae, Neisseria meningitidis
Age >50 y S pneumoniae, N meningitidis, Listeria monocytogenes, aerobic gram-negative bacilli
Immunocompromised state S pneumoniae, N meningitidis, L monocytogenes, aerobic gram-negative bacilli
Postneurosurgery Aerobic gram-negative bacilli (including Pseudomonas aeruginosa), Staphylococcus aureus, coagulase-negative staphylococci (especially Staphylococcus epidermidis)
Basilar skull fracture S pneumoniae, Haemophilus influenzae, group A β-hemolytic streptococci
Cerebrospinal fluid shunt Coagulase-negative staphylococci (especially S epidermidis), S aureus, aerobic gram-negative bacilli, Propionibacterium acnes