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Table 1 Implicated pathogens of the 261 elderly and non-elderly patients with bacterial meningitis

From: Clinical characteristics and prognosis of acute bacterial meningitis in elderly patients over 65: a hospital-based study

  Elderly patients Non-elderly patients
  (n = 87) (n = 174)
Gram positive (n = 34) (39%) (n = 62) (36%)
   Staphylococcus (n = 17) (19%) (n = 38) (22%)
Staphylococcus aureus 11 (13%) 20 (11%)
Coagulase- negative staphylococci 1 (1%) 10 (6%)
Staphylococcus epidermidis 4 (5%) 6 (3%)
Staphylococcus haemolyticus   2 (1%)
Staphylococcus saprophyticus 1 (1%)  
   Streptococcus (n = 9) (10%) (n = 16) (9%)
Viridian streptococci 3 (3%) 7 (4%)
Streptococcus pneumoniae 4 (5%) 8 (5%)
Group A beta-streptococci 1 (1%)  
Group B beta-streptococci 1 (1%) 1 (0.5%)
   Enterococcus (n = 6) (7%) (n = 3) (2%)
Enterococcus faecalis 4 (5%) 3 (2%)
Enterococcus facium 1 (1%)  
Enterococcus sp 1 (1%)  
   Listeria monocytogenes 1 (1%) 2 (1%)
   Corynebacterium 1 (1%) 2 (1%)
   Micrococcus   1 (0.5%)
Gram negative (n = 43) (49%) (n = 82) (47%)
   Acinetobacter (n = 9) (10%) (n = 13) (7%)
Acinetobacter baumannii 7 (8%) 12 (7%)
Acinetobacter lwoffii 2 (2%)  
Acinetobacter sp.   1 (0.5%)
   Pseudomonas (n = 4) (4%) (n = 13) (7%)
Pseudomonas aeruginosa 2 (2%) 9 (5%)
Pseudomonas mendocina 1 (1%) 1 (0.5%)
Pseudomonas stutzeri 1 (1%) 1 (0.5%)
Pseudomonas putida   1 (0.5%)
Pseudomonas spp.   1 (0.5%)
   Enterobacter (n = 4) (4%) (n = 7) (4%)
Enterobacter cloacae 3 (3%) 5 (3%)
Enterobacter aerogenes 1 (1%) 2 (1%)
   Klebsiella pneumoniae 16 (18%) 31 (18%)
   E coli 4 (5%) 7 (4%)
   Salmonella 2 (2%) 1 (0.5%)
   Proteus mirabilis 2 (2%)  
   Serratia marcences 1 (1%) 2 (1%)
   Elizabethkingia meningoseptica 1 (1%)  
   Others   8a (4%)
Mixed infection 10 (11%) 30 (17%)
  1. a Neisseria meningitidis (2 cases), Citrobacter diversus (1), Sphingomonas paucimobilis (1), Stenotrophomonas maltophilia (1), unclassified glucose non fermenting group (2), and Fusobacterium nucleatum (1)