Staphylococcus and related organisms

• Catalase-positive genera:
  
  • Staphylococcus
    
  • Micrococcus
    
  • Stomatococcus
    
• Catalase-negative genera:
  
  • Streptococcus
    
  • Enterococcus
    
  • Others
    
• Staphylococcus:
  
  • Nonmotile
    
  • Facultatively anaerobic
    
  • Catalase positive
    
  • Grow in medium containing 10% sodium chloride
    
  • S. aureus colonies are golden, coagulase positive
    
  • Coagulase negative Staphylococcus:
    
    • Epidermidis
      
    • Saprophyticus
      
    • Haemolyticus
      
    • Lugdunensis
      
    • Schleiferi
      
  • Micrococcus almost invariably represents contamination with skin flora
    
  • Stomatococcus mucilaginosus may cause endocarditis, septicemia, and catether related infections
    
    • Mucoid capsule allows adherence to catheters, shunts, valaves, joints.
      

    Human Colonization and diseases
    

Species	Human Colonization	Human disease
Stapylococcus
S. aureus S.epidermidis S.saprophyticus	Common Common Common	Common Common Common
S.haemolyticus S.lugdunensis S.schleiferi	Common Common Common	Uncommon Uncommon Uncommon
S.saccharolyticus S.warneri S. hominis S.auricularis S. xylosus S.simulans S.capitis S.cohini	Common Common Common Common Common Common Common Common	Rare
Micrococcus	Human Colonization	Human disease
M. luteus M.varians	Common	Rare
M.agilis M.kristinae M.lylae M.roseus M.Sedentarius	Uncommon	Rare
Stomatococcus mucilaginosus	Common	Uncommon