Micro-organisms isolated from 156 protected specimen brushes performed in 39 episodes of suspected nosocomial pneumonia.
| Micro-organisms | Total specimens | Monomicrobial | Polymicrobial | ||
| <103 cfu·mL−1 | ≥103 cfu·mL−1 | <103 cfu·mL−1 | ≥103 cfu·mL−1 | ||
| Total | 176 | 10 (5.7) | 26 (14.8) | 18 (10.2) | 122 (69.3) |
| Gramnegative bacteria | 113 (64.2) | 7 | 14 | 10 | 82 |
| Pseudomonas spp. | 42 | 4 | 10 | 4 | 24 |
| Escherphic coli | 15 | 3 | 0 | 0 | 12 |
| Other Enterobacteriacae | 15 | 0 | 0 | 0 | 15 |
| Moraxella and Neisseria spp. | 15 | 0 | 0 | 5 | 10 |
| Proteus and Providencia spp. | 11 | 0 | 0 | 1 | 10 |
| Acinetobacter and Alcaligenes spp. | 9 | 0 | 0 | 0 | 9 |
| Haemophilus spp. | 6 | 0 | 4 | 0 | 2 |
| Grampositive bacteria | 63 (35.8) | 3 | 12 | 8 | 40 |
| Streptococcus spp. | 38 | 0 | 10 | 2 | 26 |
| Staphylococcus spp. | 23 | 3 | 2 | 6 | 12 |
| Corynebacteria spp. | 2 | 0 | 0 | 0 | 2 |