Actinomyces neuii (Winkia neuii)

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Gram stain Culture

General information
- Is proven to be an exception in this genus on account of its aerobic growth, microscopic morphology (no branching), and the types and locations of infections.
  
  Taxonomy
  Family: Actinomycetaceae,
  Genus: Winkia neuii
  Formerly: Actinomyces neuii
  
  Natural habitats
  They are most likely of endogenous origin.
  
  Clinical significance
  Winkia neuii rarely causes disease in humans
  They are isolated from soft tissue abscesses, infected skin, endophthalmitis, bacteremias, and endocarditis
Gram stain
- Gram positive rods,
  
  diphteroid, but coccobacilli may occur,
  
  the rods are mainly arranged in V or Y forms.
  
  They are not branched
Culture characteristics
- Facultative anaerobic
  
  5 % CO2 improves the growth
  
  BA: colonies are circular, smooth, convex, opaque, more white than creamy in colour, and with entire edges, and 0.5-1.5 mm in diameter after 48h of incubation
  
  BBAØ: growth
Characteristics
References
- James Versalovic et al.(2011) Manual of Clinical Microbiology 10th Edition