Updated IDSA ATS Guidelines on Management of Adults With HAP and VAP Ventilator Associated Pneumonia in Adult Patients Preventive Measures: A Review of the Recent Advances Ventilator Associated Pneumonia (VAP) VAP is a subtype of hospital acquired pneumonia or Nosocomial pneumonia which occur in people who are receiving mechanical ventilation. It develops more than 48 hours after tracheal Criteria used for the diagnosis of VAP. Adapted from the European Download Scientific Diagram Ventilator associated pneumonia: The central role of transcolonization ScienceDirect Pathogenesis, Diagnosis and Therapeutic Strategies for Ventilator associated Pneumonia Journal of Pure and Applied Microbiology