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
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.
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.
- 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.
- 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.
- 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.
- 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
(c) Costin Stoica