Neisseria sicca

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Gram stain Culture

General information
- Taxonomy
  Family: Neisseriaceae
  
  Natural habitats
  Most human Neisseria spp are considered normal inhabitants of the upper respiratory tract.
  
  Clinical significance
  It can appear as an opportunistic pathogen.
  
  N. sicca was implicated, e.g., the causitive agent of endocarditis.
Gram stain
- Gram negative diplococci,
  
  appears in pairs
  
  While Neisseria species are gram negative, occasionally a tendency to withstand decolorization.
Culture characteristics
- Obligate aerobic
  
  5% CO2 improves the growth
  
  BA: they may produce a yellowish pigment
  
  The colonies are large, ≤ 3 mm, smooth, with entire edges and can form dry, wrinkled, and grayish white, although some strains may produce a yellow pigment.
  
  McConkey: no growth
  
  BBAØ: no growth
Characteristics
References
- James Versalovic et al.(2011) Manual of Clinical Microbiology 10th Edition