What is the etiology of community-acquired pneumonia (CAP)?

Updated: Oct 31, 2019
  • Author: Stephanie L Baer, MD; Chief Editor: Michael Stuart Bronze, MD  more...
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The definitive microbiologic etiology is determined in less than half of patients who develop community-acquired pneumonia (CAP); the exact rate depends on the patient population and diagnostic testing used. [1, 35, 36] Organisms have been traditionally classified as “typical” or “atypical” CAP pathogens depending on their ability to be detected on Gram stain or standard bacterial cultures.

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