Pneumonia Alphabet Soup: Reworking the Recipes (Part 1) Medbridge From Common Infection to Critical Threat Pneumonia is a lung infection that can be: Community acquired (CAP) contracted outside healthcare settings Hospital acquired (HAP) develops during a hospital stay Ventilator associated (VAP) Everything You Need To Know About the New ATS IDSA Community Acquired Pneumonia Guidelines FOAMid Pneumonia: Infection of the lung parenchyma resulting in inflammation and consolidation of alveolar spaces. Classification Community Acquired Pneumonia (CAP) Hospital Acquired Pneumonia (HAP) (48 hours after admission) Ventilator