Table 2 Microorganisms identified in early-onset VAP (n = 42) and late-onset VAP (n = 148)
Microorganism | Early-onset VAP n (%) | Late-onset VAP n (%) | p-value |
|---|---|---|---|
Gram-negative organism | 40 (95.2) | 145 (97.9) | 0.31 |
 Acinetobacter baumannii | 21 (50.0) | 78 (52.7) | 0.76 |
  MDR Acinetobacter baumannii | 20 (47.6%) | 73 (49.3) | 0.84 |
 Klebsiella pneumoniae | 8 (19.0) | 21 (14.2) | 0.44 |
  MDR Klebsiella pneumoniae | 1 (2.4) | 18 (12.2) |  |
  ESBL-Klebsiella pneumoniae | 0 (0.0) | 5 (3.4) |  |
  CRE Klebsiella pneumoniae | 1 (2.4) | 9 (6.1) |  |
 Pseudomonas aeruginosa | 3 (7.1) | 14 (9.5) | 0.64 |
  MDR Pseudomonas aeruginosa | 1 (2.4) | 2 (1.4) |  |
 Stenotrophomonas maltophilia | 2 (4.8) | 23 (15.5) | 0.07 |
  MDR Stenotrophomonas maltophilia | 2 (4.8) | 22 (14.9) |  |
 Enterobacter spp. | 2 (4.8) | 2 (1.4) | 0.17 |
  MDR Enterobacter spp. | 1 (2.4) | 2 (1.4) |  |
  ESBL-Enterobacter spp. | 1 (2.4) | 1 (2.4) |  |
 Other gram-negative organisms | 4 (1.7) | 7 (4.73) |  |
Gram-positive organism | 2 (4.8) | 3 (2.0) | 0.24 |
Staphylococcus aureus | 1 (2.4) | 2 (1.4) | 0.31 |
  MRSA | 1 (2.4) | 2 (1.4) | 0.64 |
 Other gram-positive organisms | 1 (2.4) | 1 (0.7) | 0.33 |
Multidrug-resistant pathogens** | 26 (61.9) | 121 (81.8) | 0.007* |