Ventilator Associated Pneumonia (VAP) A retrospective evaluation of multiple definitions for ventilator associated pneumonia (VAP) diagnosis in an Australian regional intensive care unit Infection, Disease & Health ()? is a lung infection that can cause serious health complications, especially in patients with weakened immune systems. When a patient is Understanding NHSN VAE definitions and tiers Mahesh Madhu Ragini posted on the topic LinkedIn Ventilator associated Pneumonia Basics VAP CDC