Neisseria flava
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.[1]
| Neisseria flava | |
|---|---|
Scientific classification  | |
| Domain: | Bacteria |
| Phylum: | Pseudomonadota |
| Class: | Betaproteobacteria |
| Order: | Neisseriales |
| Family: | Neisseriaceae |
| Genus: | Neisseria |
| Species: | N. flava |
| Binomial name | |
| Neisseria flava Bergey et al. 1923 (Approved Lists 1980) | |
Identification
Steps
- Perform Gram-stain to identify the bacterium in question, continue to step 2 if it is found to be Gram negative cocci.
- Neisseria flava is an aerobic microbe, try growing some of the same in the presence in air/air + CO2.
- 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.
- Finally, perform nitrate test.
Alternative test is Oxidative/fermentation glucose test(O/F test). If found to be oxidative, it is Neisseria spp.
References
- Scott, RM 1971, 'Bacterial endocarditis due to Neisseria flava', The Journal of Pediatrics, vol. 78, no. 4, pp. 673-5.
- 2009, Microbiological Laboratory Techniques Manual, Department of Microbiology and Immunology at the University of Melbourne
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