Rhizobium radiobacter (Agrobacterium radiobacter)

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Gram stain Culture

General information
- Taxonomy
  Family: Rhizobiaceae
  Formely: Rhizobium
  Genus: Agrobacter
  
  Natural habitat
  Environment, soil, water and plants.
  They are no part of the flora of man.
  
  Clinical significance
  Transmission probably due to exposure to contaminated instruments or solutions.
  
  Has a low virulence, except in people with lowered immunity.
Gram stain
- Gram negative rod,
  
  0.6-1.0 by 1.5-3.0 µm
  
  situated solitary or in pairs.
Culture characteristics
- Obligate Aerobic
  
  BA: colonies are convex, round, smooth, non-pigmented to light beige.
  
  After 48 hours of incubation, they are 2 mm in diameter.
  
  McConkey: growth non lactose fermenter
  After 48-72 hours of incubation, the colonies are pink and very mucoid
  
  BBAØ: no growth
Characteristics
References
- James Versalovic et al.(2011) Manual of Clinical Microbiology 10th Edition