Colonies are smooth and opaque with golden yellow pigment. Aerobic. Produce
polysaccharide from sucrose. Optimal temperature, 35
-37 ºC. Non-haemolytic.
Taxonomy
Morphology
Cultural characteristics
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References
Phylum Proteobacteria, Class Betaproteobacteria, Order Neisseriales, Family Neisseriaceae, Genus Neisseria, Neisseria flavescens
Branham 1930.
Gram-negative cocci grouped in pairs and tetrads. Non-motile. Capsule not produced.
Rarely encountered. Isolated from human clinical samples (cerebrospinal fluid). Also found in the pharynx of humans (rare).
Susceptible to colistin.
Opportunistic organism. Isolated from cerebrospinal fluid of patients with meningitis and in cases of septicaemia.
  1. Tone Tonjum, 2005. Order IV. Neisseriales ord. nov. In:  Bergey’s Manual of Systematic Bacteriology, Second edition, Vol two, part C
    The Alpha-, Beta-, Delta-, and Epsilonproteobacteria, George M. Garrity (Editor-in-Chief), pp 774-863.
  2. Daniel C. Stein, 2006. The Neisseria. In: The Prokaryotes Third Edition, Volume 5: Proteobacteria: Alpha and Beta Subclasses,
    Martin Dworkin (Editor-in-Chief), pp 602–647.
  3. Magnus Unemo (Editor-in-Chief), 2013. Laboratory diagnosis of sexually transmitted infections, including human immunodeficiency
    virus, pp 44-45. World Health Organization, ISBN 978 92 4 150584 0.
Positive results for carbonic anhydrase, catalase, iodine test (polysaccharide
synthesis from sucrose), nitrite reduction, gas production from nitrite & oxidase.

Negative results for DN-ase, beta-galactosidase, gamma-glutamyl transferase,
nitrate reduction, tributyrin hydrolysis, acid production from: fructose, glucose, lactose,
maltose, mannose & sucrose.
Neisseria flavescens
(c) Costin Stoica
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