Staphylococcus haemolyticus

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Gram stain Culture

General information
- Taxonomy
  Family: Staphylococcaceae
  
  Natural habitats
  They are part of the normal skin flora.
  
  Clinical significance
  S. haemolyticus and S .hominis are preferentially isolated from axillae and pubic areas high in apocrine glands
  
  They have a relatively low virulence and can cause infections in patients with lowered resistance, especially in immune compromised patients.
  
  CNS infections occur in implantation of foreign objects, such as intravenous catheters or bone prostheses.
  
  Is repeatedly CNS, in pure culture or in mixed culture isolated from the material, then this confirms the presence of an infection.
  
  The correct identification of CNS is necessary in order to get an idea of the pathogens in this group.
Gram stain
- Gram positive cocci,
  
  0.8-1.3 µm
  
  that occur in irregular grape-like clusters and,
  
  less often, single and in pairs, tetrads, and in short chains.
Culture characteristics
- Facultative anaerobic
  
  BA: colonies are medium, smooth, buttery, glistening and opaque, non pigmented or yellowish and hemolytic.
  
  Hemolysis may be weak sometimes.
  
  McConkey: growth
  
  BBAØ: growth
Characteristics
References
- James Versalovic et al.(2011) Manual of Clinical Microbiology 10th Edition