The Pneumonia syndromes Pneumonia can arise in seven distinct clinical settings: Community-Acquired Acute Pneumonia Community-Acquired Atypical Pneumonia Nosocomial pneumonia Aspiration Pneumonia Chronic pneumonia Necrotizing Pneumonia and Lung abscess Pneumonia in the Immunocompromised Host 1313 The Pneumonia Syndromes Pneumonia can arise in seven distinct clinical settings: Community-Acquired Acute Pneumonia Community-Acquired Atypical Pneumonia Nosocomial Pneumonia Aspiration Pneumonia Chronic Pneumonia Necrotizing Pneumonia and Lung Abscess Pneumonia in the Immunocompromised Host