Pneumonia, Community-Acquired

Paul G. Auwaerter, M.D., John G. Bartlett, M.D.
Pneumonia, Community-Acquired is a topic covered in the Johns Hopkins ABX Guide.

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PATHOGENS

  • Commonly seen organisms listed below:
  • Streptococcus pneumoniae
  • Haemophilus influenzae
  • Moraxella catarrhalis
  • Chlamydophila pneumoniae
  • Legionella species
  • Mycoplasma pneumoniae
  • Viruses: influenza A, RSV, parainfluenza, adenovirus, human metapneumovirus, rhinovirus
    • A CDC 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%), no pathogen detected in 62%[19].
  • Occasional pathogens that may need to be considered in the setting of suspected community-acquired pneumonia, e.g., if immunocompromised or other special situations:
    • Mycobacterium tuberculosis 
    • Nocardia 
    • Group A Streptococcus
    • Neisseria meningiditis 
    • Anaerobes (aspiration pneumonia )

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PATHOGENS

  • Commonly seen organisms listed below:
  • Streptococcus pneumoniae
  • Haemophilus influenzae
  • Moraxella catarrhalis
  • Chlamydophila pneumoniae
  • Legionella species
  • Mycoplasma pneumoniae
  • Viruses: influenza A, RSV, parainfluenza, adenovirus, human metapneumovirus, rhinovirus
    • A CDC 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%), no pathogen detected in 62%[19].
  • Occasional pathogens that may need to be considered in the setting of suspected community-acquired pneumonia, e.g., if immunocompromised or other special situations:
    • Mycobacterium tuberculosis 
    • Nocardia 
    • Group A Streptococcus
    • Neisseria meningiditis 
    • Anaerobes (aspiration pneumonia )

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