Actinomyces oris

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Gram stain Culture

General information
- previously Actinomyces naeslundii genospecies 2
  
  Taxonomy
  Family: Actinomycetaceae,
  
  Natural habitats
  They are commonly isolated in the human oral cavity and play a major role in the formation of oral biofilm or dental plaque.
  
  Clinical significance
  A. oris, A. odontolyticus, and A. viscosus are the primary Actinomyces species in infants' mouths as well as in early dental plaque.
  
  A. oris it has also been linked to root caries, periodontal disease and even opportunistic infections such as actinomycosis.
Gram stain
- Long, gram positive rods,
  
  with many short branches
Culture characteristics
- Facultative anaerobic
  
  BA: Colonies appear as white, cream or pinkish, smooth, convex and have entire edges.
  
  Occasional rough forms may sometimes occur.
  
  BBAØ: growth
Characteristics
References
- James Versalovic et al.(2011) Manual of Clinical Microbiology 10th Edition