Diagnosaurus
Community-acquired pneumonia
Etiology
Bacterial
- Streptococcus pneumoniae (most common)
- Haemophilus influenzae
- Mycoplasma pneumoniae (young adults, summer & fall)
- Chlamydia pneumoniae (young adults)
- Staphylococcus aureus (influenza epidemics, IV drug use, bronchiectasis)
- Neisseria meningitides
- Moraxella catarrhalis (lung disease, elderly)
- Klebsiella pneumoniae (alcohol, diabetes)
- Legionella spp. (contaminated construction site, water source, or air conditioner)
Viral
- Influenza virus
- Respiratory syncytial virus
- Adenovirus
- Parainfluenza virus
Special risk factors
- Chlamydia psittaci (psittacosis): birds
- Coxiella burnetii (Q fever): cattle, sheep, goats; especially newborns or products of conception
- Francisella tularensis (tularemia): tick or skinning rabbit
- Endemic fungi (Blastomyces: Ohio & Mississippi River valleys; Coccidioides: Southwest United States or Latin America; Histoplasma: Ohio & Mississippi River valleys)
- Sin nombre virus (hantavirus pulmonary syndrome): rodent waste, Southwest United States
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Last updated: January 13, 2015
Citation
Zeiger, Roni F.. "Community-acquired Pneumonia." Diagnosaurus, 4th ed., McGraw-Hill Education, 2015. Emergency Central, emergency.unboundmedicine.com/emergency/view/Diagnosaurus/114742/all/Community_acquired_pneumonia.
Zeiger RFR. Community-acquired pneumonia. Diagnosaurus. McGraw-Hill Education; 2015. https://emergency.unboundmedicine.com/emergency/view/Diagnosaurus/114742/all/Community_acquired_pneumonia. Accessed May 17, 2025.
Zeiger, R. F. (2015). Community-acquired pneumonia. In Diagnosaurus (4th ed.). McGraw-Hill Education. https://emergency.unboundmedicine.com/emergency/view/Diagnosaurus/114742/all/Community_acquired_pneumonia
Zeiger RFR. Community-acquired Pneumonia [Internet]. In: Diagnosaurus. McGraw-Hill Education; 2015. [cited 2025 May 17]. Available from: https://emergency.unboundmedicine.com/emergency/view/Diagnosaurus/114742/all/Community_acquired_pneumonia.
* Article titles in AMA citation format should be in sentence-case
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T1 - Community-acquired pneumonia
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A1 - Zeiger,Roni F,
Y1 - 2015/01/13/
BT - Diagnosaurus
UR - https://emergency.unboundmedicine.com/emergency/view/Diagnosaurus/114742/all/Community_acquired_pneumonia
PB - McGraw-Hill Education
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DB - Emergency Central
DP - Unbound Medicine
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