PNEUMONIA is a topic covered in the Harrison's Manual of Medicine.

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Pneumonia, an infection of the lung parenchyma, is classified as community-acquired (CAP) or health care–associated (HCAP). The HCAP category is subdivided into hospital-acquired pneumonia (HAP) and ventilator-associated pneumonia (VAP). HCAP is associated with current hospitalization for ≥48 h, hospitalization for ≥2 days in the prior 3 months, residence in a nursing home or extended-care facility, antibiotic therapy in the preceding 3 months, chronic dialysis, home infusion therapy, home wound care, and contact with a family member who has a multidrug-resistant (MDR) infection.

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