Table 3 Microorganisms isolated from 257 episodes of postoperative pneumonia
Microorganisms, n (%) | VAP | Non-VAP | P- value |
|---|---|---|---|
(n =137) | (n =120) | ||
Polymicrobial infection | 58 (42.3) | 43 (35.8) | 0.29 |
Non-fermenting Gram-negative bacilli | 40 (29.2) | 27 (22.5) | 0.22 |
Pseudomonas aeruginosa | 35 (25.5) | 26 (21.7) | 0.47 |
Acinetobacter baumannii | 3 (2.2) | 0 | 0.29 |
Stenotrophomonas maltophilia | 2 (1.5) | 1 (0.8) | 0.99 |
Enterobacteriaceae | 60 (43.8) | 47 (39.2) | 0.53 |
Escherichia coli | 15 (10.9) | 13 (10.8) | 0.98 |
Enterobacter spp | 14 (10.2) | 6 (5) | 0.12 |
Klebsiella spp | 8 (5.8) | 11 (9.2) | 0.31 |
Hafnia alvei | 4 (2.9) | 4 (3.3) | 0.85 |
Citrobacter spp | 6 (4.4) | 5 (4.2) | 0.93 |
Proteus spp | 7 (5.1) | 6 (5) | 0.97 |
Morganella morganii | 1 (0.7) | 0 | 0.99 |
Serratia marcescens | 5 (3.6) | 2 (1.7) | 0.33 |
Staphylococcus aureus | |||
Methicillin-susceptible S. aureus | 14 (10.2) | 4 (3.3) | 0.031 |
Methicillin-resistant S. aureus | 1 (0.7) | 0 | 0.99 |
Haemophilus spp | 34 (24.8) | 27 (22.5) | 0.66 |
Neisseria spp | 9 (6.6) | 6 (5) | 0.59 |
Streptococcus spp | 20 (14.6) | 13 (10.8) | 0.37 |
Streptococcus pneumoniae | 2 (1.5) | 7 (5.8) | 0.057 |
Other streptococci | 18 (13.1) | 6 (5) | 0.025 |
Total microorganisms isolated | 178 | 124 |