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:
  • Mycobacterium tuberculosis
  • Nocardia
  • Group A Streptococcus
  • Neisseria meningiditis
  • Anaerobes (aspiration pneumonia )