Streptomyces griseus

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Gram stain Culture

General information
- The Streptomyces group contains approximately 597 validly named species or subspecies and remains problematic. Many of these species have been patented because of the commercially useful products they synthesize.
  
  Taxonomy Family: Streptomycetaceae
  
  Natural habitats
  In the environment, soil, sand and rotten plant material. Especially from North- and South America, Africa and Arabia.
  
  Clinical significance
  The most common type of infection is mycetoma, they penetrate in wounds in the skin.
Gram stain
- Gram positive rods, 0.5-2.0 µm, highly branched, and stain more solidly gram positive than Nocardia (beading). Mycelium fragments rarely.
  
  modified Kinyoun negative
Culture characteristics
- Obligate aerobic BA: initially the colonies have a smooth surface, later can develop an aerial hyphae, that gives the colonies a powdered or velvety look.
  The colonies are leathery, or butyrous and grayish.
  
  Substrate hyphae: variable
  
  Aerial hyphae: variable
  
  BBAØ: no growth
  
  Motile: non
Characteristics
References
- James Versalovic et al.(2011) Manual of Clinical Microbiology 10th Edition