Molecular Profiling of Innate Immune Response Mechanisms in Ventilator associated Pneumonia ScienceDirect VAP Diagnosing and Managing Ventilator Associated Pneumonia ()? is a lung infection that can cause serious health complications, especially in patients with weakened immune systems. When a patient is Life in icu follow for more clinical tips Ventilator Associated Pneumonia (VAP) Definition: Pneumonia that develops 4872 hours after endotracheal intubation and mechanical ventilation. Common Causes Gram negative bacilli