Ventilator associated pneumonia: mechanisms, an appraisal of current therapies and the role for inhaled antibiotics in Today's Topic: Ventilator Associated Pneumonia (VAP) VAP is a type of pneumonia that develops 48 hours or more after intubation and mechanical ventilation. Why It Happens: Bacteria enter the Full article: The pathogenesis of ventilator associated pneumonia: old and new mechanisms vap intubation Main endogenous and exogenous risk factors for VAP Researchers screen for ventilator associated pneumonia infection through breath test EurekAlert!