After 24 h, colonies are small, smooth, translucent, slightly butyrous, and often have a
yellowish tinge. At 48 h, colonies are 0.6
-1.0 mm in diameter, opaque, grayish white,
raised, finely granular, glistening, and convex. They become mucoid if incubation is
prolonged.
Primary isolation is made on chocolate agar at temperatures of 35
-36 ºC under an
atmosphere containing 3
-10% CO2 and high relative humidity. Minimum growth
temperature is 30 ºC.
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Betaproteobacteria, Order Neisseriales, Family Neisseriaceae, Genus Neisseria, Neisseria lactamica
Hollis et al. 1969.

Old synonym: "
Neisseria lactamicus" Hollis et al. 1969.
Gram-negative cocci grouped in pairs. Nonmotile. Endospores are not produced.
Isolated from  the nasopharynx, usually in children and young teenagers. Resistant to colistin.
Rarely pathogenic, but could be a possible cause of meningitis.
  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. Hollis (D.G.), Wiggins (G.L.) and Weaver (R.E.): Neisseria lactamicus sp. n., a lactose-fermenting species resembling Neisseria
    meningitidis. Applied Microbiology, 1969, 17, 71-77.
  3. 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.
  4. 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 beta-D-galactosidase (ONPG), carbonic anhydrase, catalase, nitrite reduction (with gas production), oxidase, acid
production from glucose, lactose & maltose.

Negative results for DN-ase, iodine test (polysaccharide synthesis from sucrose), nitrate reduction, tributyrin hydrolysis, urease, acid
production from: fructose, mannose & sucrose
Neisseria lactamica
(c) Costin Stoica
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