Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus rubneri Huch
et al. 2013.
Gram-positive cocci. Non-spore-forming.
Colonies grown on Columbia CNA 5 % sheep blood agar at 37 ºC are 1-3 mm in
diameter, opaque white, raised with an entire margin. Beta-hemolytic. Facultatively
anaerobic. Grow in brain heart broth at 25, 30 and 37 ºC, some strains grow at 45 ºC.
No gas production in brain heart medium and no growth at pH 9.6.
The type strain was isolated from a human throat in Germany.
- Melanie Huch, Katrien De Bruyne, Ilse Cleenwerck, Achim Bub, Gyu-Sung Cho, Bernhard Watzl, Isabel Snauwaert, Charles M.
A. P. Franz, Peter Vandamme. Streptococcus rubneri sp. nov., isolated from the human throat. Int J Syst Evol Microbiol, November
2013 63: 4026-4032.
Positive results for leucine aminopeptidase, acid production from: cellobiose,
N-acetylglucosamine, D-fructose, D-galactose, D-glucose, lactose, D-mannose,
maltose, raffinose, salicin & sucrose.
Negative results for alkaline phosphatase, arginine hydrolysis, catalase, esculin hydrolysis, alpha-D-galactosidase,
beta-D-galactosidase, beta-D-glucosidase, beta-D-glucuronidase, hippurate hydrolysis, pyrrolidonyl arylamidase, starch hydrolysis,
Voges-Proskauer reaction, acid production from: D- or L-arabinose, D- or L-arabitol, D-adonitol, amygdalin, arbutin, dulcitol, esculin,
erythritol, D- or L-fucose, glycerol, glycogen, gentiobiose, 2- or 5-ketogluconate, inositol, inulin, D-lyxose, methyl beta-D-xyloside,
D-mannitol, methyl alpha-D-mannopyranoside, methyl alpha-D-glucopyranoside, melezitose, L-rhamnose, D-ribose, L-sorbose,
starch, D-tagatose, trehalose, D- or L-xylose & xylitol.
Acid production from melibiose & D-sorbitol is variable.
(c) Costin Stoica