()? is a lung infection that can cause serious health complications, especially in patients with weakened immune systems. When a patient is Ventilator associated pneumonia: pathobiological heterogeneity and diagnostic challenges Nature Communications Ventilator Associated Pneumonia Medicine Question Bank Ventilator Associated Pneumonia (VAP) is a serious lung infection that occurs in patients on mechanical ventilation for over 48 hours. It is often caused by bacteria entering the lungs through the ventilator, leading