Number of ventilator-associated pneumonia (VAP) patients with newly isolated micro-organisms from endotracheal aspirates after initiation of antibiotic treatment. □: Staphylococcus aureus; ▒: Enterobacteriaceae; ░: Pseudomonas aeruginosa. Number of ventilator-associated pneumonia (VAP) patients with newly isolated micro-organisms from endotracheal aspirates after initiation of antibiotic treatment. □: Staphylococcus aureus; ▒: Enterobacteriaceae; ░: Pseudomonas aeruginosa. Reprinted from [6] with permission from the publisher. J. Chastre, and C. E. Luyt Eur Respir Rev 2007;16:40-44 ©2007 by European Respiratory Society