Ventilator associated pneumonia: pathobiological heterogeneity and diagnostic challenges Nature Communications VAP Bundle Ventilator Associated Pneumonia Ventilator Associated Pneumonia ( VAP) is a lung infection that occurs in patients who are on mechanical ventilation for more than 48 hours. A VAP bundle is a set of Vap Acronym Ventilator Acquired Pneumonia Lung Stock Illustration 2725534863 Shutterstock VAP Ventilator Associated Pneumonia Preventions Ventilator Acquired Pneumonia VAP Preventions