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. Clinical Case: Importance of Diagnostics for Optimal Antibiotic Therapy in a COVID 19 Patient with Ventilator Associated Pneumonia Pioneering Diagnostics New approaches to the aetiological diagnosis of VAP European Respiratory Society Screening for ventilator associated pneumonia infection through a breath test