Table 3 Microorganisms isolated in ventilator-associated pneumonia
Microorganism | Heat and moisture exchangers | Heated humidifiers |
|---|---|---|
Total Gram-positive cocci | 8 (8 primary endogenous) | 3 (1 primary endogenous and 2 secondary endogenous) |
Methicillin-sensitive Staphylococcus aureus | 5 (5 primary endogenous) | 1 (1 primary endogenous) |
Methicillin-resistant Staphylococcus aureus | 0 | 1 (1 secondary endogenous) |
Streptococcus pneumoniae | 3 (3 primary endogenous) | 0 |
Streptococcus faecalis | 0 | 1 (1 secondary endogenous) |
Total Gram-negative bacilli | 13 (12 secondary endogenous and 1 exogenous) | 5 (4 secondary endogenous and 1 exogenous) |
Pseudomonas aeruginosa | 5 (5 secondary endogenous) | 2 (1 secondary endogenous and 1 exogenous) |
Escherichia coli | 0 | 1 (1 secondary endogenous) |
Klebsiella spp. | 3 (2 secondary endogenous and 1 exogenous) | 0 |
Enterobacter spp. | 2 (2 secondary endogenous) | 1 (1 secondary endogenous) |
Serratia marcescens | 3 (3 secondary endogenous) | 0 |
Proteus mirabilis | 0 | 1 (1 secondary endogenous) |
Total | 21 (8 primary endogenous, 12 secondary endogenous and 1 exogenous) | 8 (1 primary endogenous, 6 secondary endogenous and 1 exogenous) |