What causes community-acquired pneumonia (CAP)?

Updated: Oct 31, 2019
  • Author: Stephanie L Baer, MD; Chief Editor: Michael Stuart Bronze, MD  more...
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Typical bacterial pathogens that cause CAP include S pneumoniae, H influenzae, and M catarrhalis. Numerous other organisms can cause CAP in the appropriate clinical setting. Furthermore, the so-called “atypical CAP” pathogens are actually common causes of CAP and were originally classified as atypical because they are not readily detectable on Gram stain or cultivatable on standard bacteriologic media.

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