Johns Hopkins ABX Guide
Pneumonia, Community-Acquired (Adult)
PATHOGENS
- Commonly seen organisms are listed below:
- Streptococcus pneumoniae
- Haemophilus influenzae
- Moraxella catarrhalis
- Chlamydophila pneumoniae
- Legionella species
- Mycoplasma pneumoniae
- Viruses: SARS-CoV-2, influenza A, RSV, parainfluenza, adenovirus, human metapneumovirus, rhinovirus
- A CDC 2015 report of extensive microbiologic testing of 2,300 adults hospitalized for CAP showed the most common pathogens were rhinovirus (9%), influenza (6%), and S. pneumonia (5%), with no pathogen detected in 62%[21].
- Occasional pathogens that may need to be considered in the setting of suspected community-acquired pneumonia, e.g., if immunocompromised or in other special situations:
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Last updated: October 9, 2022
Citation
Auwaerter, Paul G. "Pneumonia, Community-Acquired (Adult)." Johns Hopkins ABX Guide, The Johns Hopkins University, 2022. Johns Hopkins Guides, www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540442/3/Pneumonia__Community_Acquired__Adult_.
Auwaerter PG. Pneumonia, Community-Acquired (Adult). Johns Hopkins ABX Guide. The Johns Hopkins University; 2022. https://www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540442/3/Pneumonia__Community_Acquired__Adult_. Accessed November 3, 2025.
Auwaerter, P. G. (2022). Pneumonia, Community-Acquired (Adult). In Johns Hopkins ABX Guide. The Johns Hopkins University. https://www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540442/3/Pneumonia__Community_Acquired__Adult_
Auwaerter PG. Pneumonia, Community-Acquired (Adult) [Internet]. In: Johns Hopkins ABX Guide. The Johns Hopkins University; 2022. [cited 2025 November 03]. Available from: https://www.hopkinsguides.com/hopkins/view/Johns_Hopkins_ABX_Guide/540442/3/Pneumonia__Community_Acquired__Adult_.
* Article titles in AMA citation format should be in sentence-case
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