What are the most common etiologies of community-acquired pneumonia (CAP) in the hospital setting?

Updated: Sep 30, 2020
  • Author: Justina Gamache, MD; Chief Editor: Guy W Soo Hoo, MD, MPH  more...
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The most common etiologies of CAP in the non–intensive care unit (ICU) inpatient setting, in descending order of frequency, are as follows: [3] S pneumoniaeM pneumoniaeC pneumoniaeH influenzaeLegionella species, aspiration, and respiratory viruses. Legionella pneumophilainfections tend to occur sporadically and in local epidemic clusters. These infections usually arise in the summer and fall and may be found in the water condensed from air conditioning systems.

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