Colonies are large, mucoid, and often adherent. Most strains are nonpigmented or
grayish to buff yellow colonies. Nonhaemolytic.
Biovar heidelbergensis produce smaller colonies of more butyrous consistence than
biovar mucosa and some strains produce yellow pigment.
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Betaproteobacteria, Order Neisseriales, Family Neisseriaceae, Genus Neisseria, Neisseria mucosa
(von Lingelsheim 1906) Veron et al. 1959.
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N. mucosa biovar heidelbergensis
- N. mucosa biovar mucosa
According to Bennett et al. (2013), Neisseria mucosa var. heidelbergensis should be renamed Neisseria oralis.
Old synonym: "Diplococcus mucosus" von Lingelsheim 1906.
Gram-negative cocci occuring singly or grouped in pairs. Nonmotile. Endospores are
not produced.
Isolated from nasopharynx of humans and from the respiratory tissues in dolphins (1 report).
Pathogenic for mice. Occasionally pathogenic for humans, causing pneumonia in children (rare).
  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. Julia S. Bennett,  Keith A. Jolley, Martin C. J. Maiden. Genome sequence analyses show that Neisseria oralis is the same species
    as ‘ Neisseria mucosa var. heidelbergensis’. Int J Syst Evol Microbiol, October 2013 63: 3920-3926.
  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.
  4. 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.
Biovar heidelbergensis differes from biovar mucosa by deoxyribonuclease activity and
more gas production from nitrite.

Positive results for carbonic anhydrase, catalase, iodine test (polysaccharide synthesis from sucrose), nitrate reduction, nitrite
reduction (with gas production), oxidase, acid production from: fructose, glucose, maltose & sucrose.

Negative results for beta-galactosidase, gamma-glutamyl transferase, tributyrin hydrolysis, acid production from: lactose & mannose.
Neisseria mucosa
(c) Costin Stoica
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