What is VAP?, Ventilator Associated Pneumonia is a lung infection that develops 48 hours or more after endotracheal intubation. It increases ventilator days, costs, and mortality., The Power of Streamlined Definition for Ventilator Associated Pneumonia a Download Table Criteria used for the diagnosis of VAP. Adapted from the European Download Scientific Diagram Ventilator Associated Pneumonia (VAP): Why is it so difficult to define? In real world practice: The diagnosis of VAP remains more an exercise in clinical integration than strict adherence to criteria.