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Pneumonias acquired from others. 1. History, examination, laboratory findings.

Differential diagnosis of community-acquired pneumonia can be elusive, even though the disease remains a frequent cause of admission to the hospital. The familiar organisms--pneumococci, group A streptococci, Staphylococcus aureus, Klebsiella pneumoniae, and Hemophilus influenzae--are still often the cause. However, less common organisms, in particular Pneumocystis carinii, which is associated with acquired immunodeficiency syndrome, are being seen more often. Data gathered from a thorough history, physical examination, laboratory testing, and sputum evaluation must be considered as a body of evidence, and a pattern often emerges that suggests a particular clinical picture.