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 is an opportunistic pathogen, often associated with infections in immunocompromised patients. It can cause bloodstream infections, endocarditis, urinary tract infections, and infections related to implanted medical devices.
  S. haemolyticus is known for its antibiotic resistance, including resistance to methicillin, making treatment challenging, and is often implicated in infections in immunocompromised individuals.
  
  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