Fig. 2. Evolution of clinical pulmonary infection score in patients of the sensitive strain group treated with intravenous β-lactam combined with a 3-day intravenous administration of aminoglycoside or quinolone (A ) and in patients of the multidrug-resistant strain group treated with nebulized colistin either in monotherapy (n = 28) or combined with a 3-day intravenous administration of aminoglycoside (n = 15) (B ). Red square = clinical cure of ventilator-associated pneumonia; blue circle = clinical failure of antibiotics for treating ventilator-associated pneumonia (VAP). P  values indicate statistical significance for repeated measures (time effect) and significant interaction between patients with clinical cure of VAP and patients in whom antibiotics failed to cure VAP. MDR = multidrug resistant.