Bugs Causing Pneumonia Bug Neon. <4 wks Kids<18 yrs Adults18-40 Adults40-65 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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