Kocuria kristinae (Rothia kristinae)

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Gram stain Culture

General information
- Taxonomy
  Family: Micrococcaceae
  Genus: Rothia kristinae
  Formely: Kocuria kristinae
  
  Natural habitats
  Micrococci are widespread in nature and are commonly found on the skin of humans and other mammals.
  
  Clinical significance
  They thought of as harmless or commensal organism, though it can be an opportunistic pathogen, there have been rare cases of infections in people with compromised immune systems.
Gram stain
- Gram positive cocci,
  
  0.5-3.5 µm,
  
  occurring mostly tetrads, and irregular clusters.
  
  Mature cells lose the ability to retain the crystal violet, which makes them decolorization easier than younger cells.
Culture characteristics
- Obligate aerobic
  
  BA: after 48 hours the colonies are 1-2 mm in diameter (grow more slowly than staphylococci).
  
  Colonies dull or matte, convex and have a pale orange pigment
  
  McConkey: growth
  
  BBAØ: no growth
Characteristics
References
- James Versalovic et al.(2011) Manual of Clinical Microbiology 10th Edition