General Facts and Figures Classification Presentation History Physical Exam Labs Radiology Diagnosis Criteria for diagnosis Differential Microbiology General Specific organisms Pharmacology Drug classes Mechanism of action Resistance Treatment General Site of care Medication Duration Assessment of response Prevention References Literature cited Complete bibliography Links More...		Diagnosis Differential a large number of bacteria cause pneumonia; the most common are Streptococcus pneumoniae, Haemophilus influenzae, Mycoplasma pneumoniae, Chlamydia pneumoniae, Legionella pneumophila, Moraxella catarrhalis, Klebsiella pneumoniae (see the Microbiology - Specific Organisms section for a review); exact incidences are difficult to ascertain non-bacterial pathogens in the differential include many viruses (influenza, adenovirus, rhinovirus, etc.) and fungi (Aspergillus spp., Candida spp., Coccidioides immitis, etc.) noninfectious conditions can also present as pneumonia and include: CHF, pulmonary infiltrates with eosinophilia, pulmonary hemorrhage, TB, Goodpasture's syndrome, pulmonary embolism, neoplastic disease, radiation injury, inhalation injury, pulmonary contusion, bronchiolitis obliterans with organizing pneumonia (BOOP), Wegener's granulomatosis, collagen-vascular disorders (including rheumatoid lung disease, SLE, scleroderma), amyloidosis, sarcoidosis, interstitial pneumonitis (e.g., farmers, bird breeders), and drug reactions (e.g., hydrochlorothiazide, asbestos, silicosis, etc.)

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