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Community-acquired pneumonia

Community-acquired pneumonia is a topic covered in the Diagnosaurus.

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  • 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)


  • 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


Zeiger, Roni F.. "Community-acquired Pneumonia." Diagnosaurus, 4th ed., McGraw-Hill Education, 2015. Emergency Central, emergency.unboundmedicine.com/emergency/view/Diagnosaurus/114742/0/Community_acquired_pneumonia.
Zeiger RF. Community-acquired pneumonia. Diagnosaurus. 4th ed. McGraw-Hill Education; 2015. https://emergency.unboundmedicine.com/emergency/view/Diagnosaurus/114742/0/Community_acquired_pneumonia. Accessed June 18, 2019.
Zeiger, R. F. (2015). Community-acquired pneumonia. In Diagnosaurus. Available from https://emergency.unboundmedicine.com/emergency/view/Diagnosaurus/114742/0/Community_acquired_pneumonia
Zeiger RF. Community-acquired Pneumonia [Internet]. In: Diagnosaurus. McGraw-Hill Education; 2015. [cited 2019 June 18]. Available from: https://emergency.unboundmedicine.com/emergency/view/Diagnosaurus/114742/0/Community_acquired_pneumonia.
* Article titles in AMA citation format should be in sentence-case
TY - ELEC T1 - Community-acquired pneumonia ID - 114742 A1 - Zeiger,Roni F, Y1 - 2015/01/13/ BT - Diagnosaurus UR - https://emergency.unboundmedicine.com/emergency/view/Diagnosaurus/114742/0/Community_acquired_pneumonia PB - McGraw-Hill Education ET - 4 DB - Emergency Central DP - Unbound Medicine ER -