Table 5 Microorganisms responsible for VAP
|  | No corticosteroids (n = 138) | Corticosteroids (n = 74) |
|---|---|---|
Gram-positive cocci | 22 (15.9) | 13 (17.6) |
 MSSA | 12 (8.8) | 7 (9.5) |
 MRSA | 5 (3.6) | 0 (0.0) |
 Enterococcus spp. | 3 (2.2) | 4 (5.4) |
 Streptococcus pneumoniae | 2 (1.5) | 2 (2.7) |
Gram-negative bacilli | 83 (60) | 44 (59.5) |
 Pseudomonas aeruginosa | 24 (17.5) | 17 (23) |
 Enterobacter spp. | 20 (14.6) | 14 (18.9) |
 Klebsiella pneumoniae | 6 (4.4) | 5 (6.8) |
 Escherichia coli | 12 (8.8) | 2 (2.7) |
 Acinetobacter baumannii | 9 (6.6) | 2 (2.7) |
 Stenotrophomonas maltophilia | 2 (1.5) | 0 (0.0) |
 Serratia marcescens | 2 (1.5) | 2 (2.7) |
 Citrobacter freundii | 4 (2.9) | 0 (0.0) |
 Proteus mirabilis | 1 (0.7) | 1 (1.4) |
 Haemophilus influenza | 2 (1.5) | 0 (0.0) |
 Morganella morganii | 1 (0.7) | 1 (1.4) |
Other* | 17 (12.3) | 9 (12.1) |
Polymicrobial | 15 (10.9) | 8 (10.8) |
Multidrug-resistant isolates | 26 (19.0) | 21 (28.4) |