Ventilator associated pneumonia: A lung infection that can occur in people who are on mechanical ventilation, Ventilator Associated Pneumonia (VAP) Table III from Ventilator Associated Pneumonia ( VAP ) Semantic Scholar VAP Bundle Ventilator Associated Pneumonia Ventilator Associated Pneumonia ( VAP) is a lung infection that occurs in patients who are on mechanical ventilation for more than 48 hours. A VAP bundle is a set of