Diagnosis, management and treatment of nosocomial pneumonia in ICU Serene Today's Topic: Ventilator Associated Pneumonia (VAP) VAP is a type of pneumonia that develops 48 hours or more after intubation and mechanical ventilation. Why It Happens: Bacteria enter the Ventilator associated pneumonia The BMJ A retrospective evaluation of multiple definitions for ventilator associated pneumonia (VAP) diagnosis in an Australian regional intensive care unit Infection, Disease & Health Ventilator associated pneumonia: A lung infection that can occur in people who are on mechanical ventilation,