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Med Clin North Am. 2001 Nov;85(6):1349-65, vii.

The role of atypical pathogens in community-acquired pneumonia.

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  • 1Division of Infectious Diseases, Indiana University School of Medicine, Indianapolis, Indiana, USA.


The atypical pathogens in community-acquired pneumonia traditionally have included Mycoplasma pneumoniae, Chlamydia pneumoniae, and Legionella spp. Recent studies documenting their epidemiology and clinical characteristics have shown that these organisms are indistinguishable from the pneumococcus. Furthermore, therapy no longer depends on the specific bacterial cause of community-acquired pneumonia. Etiologic diagnosis is still difficult, although new methods are becoming available. This article focuses on these issues and on why the term atypical is no longer meaningful.

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