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Microbiological agents in the tracheal aspirate cultures of the placebo and 2% chlorhexidine/toothbrushing groups
| Agent | Placebo | Chlorhexidine |
| Pseudomonas aeruginosa | 5 | 2 |
| Klebsiella pneumonia | 2 | 4 |
| Staphylococcus aureus | 2 | 3 |
| Acinetobacter baumannii | 0 | 2 |
| Proteus mirabilis | 1 | 0 |
