Trisha Shetty (Editor)

Neisseria flava

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Kingdom
  
Bacteria

Class
  
Beta Proteobacteria

Family
  
Neisseriaceae

Rank
  
Species

Phylum
  
Proteobacteria

Order
  
Neisseriales

Genus
  
Neisseria

Similar
  
Neisseria sicca, Neisseria mucosa, Neisseria cinerea, Neisseria elongata, Neisseria polysaccharea

Neisseria flava (Latin: flava, yellow, golden) is a bacterium belonging to a group of species under the genus Neisseria that is considered non-pathogenic. Along with its other members of the non-pathogenic group, Neisseria flava is often found in the upper respiratory tract surface in humans. On rare occasions, it can cause rheumatic heart disease and ventricular septal defect aortic insufficiency.

Identification

Steps

  1. Perform Gram-stain to identify the bacterium in question, continue to step 2 if it is found to be Gram negative cocci.
  2. Neisseria flava is an aerobic microbe, try growing some of the same in the presence in air/air + CO2.
  3. Transfer sample able to growth in air to a NA medium at 25C, continue to step 4 if colonies are observed.
  • If not, be aware of the microbe being handled, it is either Neisseria meningitidis or Neisseria gonorrhoeae, both of which are pathogenic.
    1. Finally, perform nitrate test.

    Alternative test is Oxidative/fermentation glucose test(O/F test). If found to be oxidative, it is Neisseria spp.

  • If positive in the final test, the microbe is Moraxella.
  • If negative in the final test, the microbe is Neisseria spp.

    • References

    Neisseria flava Wikipedia
    (Text) CC BY-SA