Microbiology of Pneumonia

Bugs Causing Pneumonia

Bug Neon. <4 wks Kids <18 yrs Adults 18-40 Adults 40-65 Elderly Nosoc. IC EtOH/ IVDA CF Post- viral Atypical S. aureus           X X X   X   S. pneumoniae   X X X X     X    X   Group B strep X                     E. coli X                     K. pneumoniae               X       Serratia           X           P. aeruginosa                 X     H. influenzae       X X         X   L. pneumophila                     X Chlamydophila   X X               X M. pneumoniae   X X X             X CMV             X         RSV   X                   Parainfluenza X X                   H. capsulatum                       C. immitis                       P. brasiliensis                       C. neoformans                       P. jiroveci             X         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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