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Updated: Mar 6 2023

Microbiology of Pneumonia

  • Bugs Causing Pneumonia
    • Bug
      Neon.
      <4 wks
      Kids
      <18 yrs
      Adults
      18-40
      Adults
      40-65
      ElderlyNosoc.ICEtOH/
      IVDA
      CFPost-
      viral
      Atypical
      S. aureusXXXX
      S. pneumoniaeXXXXX X
      Group B strepX
      E. coliX
      K. pneumoniaeX
      SerratiaX
      P. aeruginosaX
      H. influenzaeXXX
      L. pneumophilaX
      ChlamydophilaXXX
      M. pneumoniaeXXXX
      CMVX
      RSVX
      ParainfluenzaXX
      H. capsulatum
      C. immitis
      P. brasiliensis
      C. neoformans
      P. jiroveciX
    • Most common causes
      • typical
        • S. pneumoniae
          • causes 50-75% of community-acquired pneumonia!
      • atypical
        • Mycoplasma pneumoniae
        • Chlamydia pneumoniae
        • Legionella pneumophila
    • Additonal rules of thumb
      • older adults and elderly
        • anaerobic bacteria
        • viruses
        • Gram-negative rods
      • nosocomial
        • enteric Gram-negative rods
      • immunocompromised
        • enteric Gram-negative rods
        • fungi
        • viruses
      • aspiration pneumonia
        • normal mixed oral flora
        • anaerobes
    • Standard treatment
      • cephalosporin
        • cover Gram-positives
      • macrolide
        • cover atypical causes
    • Bronchitis
      • acute bronchitis is almost always due to a virus
    • Abbreviations
      • Neon. = neonates
      • Nosoc. = nosocomial infections
      • EtOH/IVDA = alcoholics/intravenous drug abusers
      • CF = cystic fibroris
      • IC = immunocompromised
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