Microbiology

• Impetigo overall: Strep
• Impetigo contagiosa (non bullous): Strep (esp in warmer climate)>Strep+Staph (staph is usually a secondary colonizer)> staph
• Bullous impetigo: Staph aureus phage gp II>>>Rarely Strep
• Ecthyma (pyogenicum): Strep> Strep+Staph>Staph
• Ecthyma gangrenosum: Pseudomonas aeruginosa
• Erysipelas: Streptococci and rarely if at all Staph
• Cellulitis: Strep> Staph (occasional cause)
• Folliculitis : staph
• Furuncle : Staph aureus
• Carbuncle : staph aureus
• Sycosis : Staph aureus
• Periporitis : Staph
• Acute paronychia : staph aureus
• Erythrasma : Corynebacteriumminutissmum
• Erysipeloid : Erysipelothrix rusiopathiae
• Melioidosis : Burkholderia pseudomallei
• Glanders : Burkholderia mallei
• Rhinoscleroma : Klebsiella pneumoniae rhinoscleromatis (Klebsiella rhinoscleromatis)
• Cat scratch disease : Bartonella (Rochalimea) henselae
• Bacillary angiomatosis: B. henselae and B. quintana
• Oroya fever: Bartonella bacilliformis.
• Tropical (phagedenic) ulcer: at least two organisms, one of which is a Fusobacterium spp., usually F. ulcerans; the others include spirochetes or other anaerobic bacteria