Streptococcus sobrinus
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus sobrinus  
Coykendall 1983.

Synonym:
Streptococcus mutans subsp. sobrinus Coykendall 1974.
Non-groupable with Lancefield antisera. Member of the "Mutans group".
Gram positive cocci, 0.5 µm in diameter,  arranged in pairs to medium-long chains,
nonmotile.
Colonies on agar containing sucrose are about 1 mm in diameter, rough, and
heaped and often have droplets of liquid at the top or the border. Nonhaemolytic,
some strains are alpha-hemolytic.
Facultatively anaerobic, optimal growth at 37.0 ºC. Growth at 45 ºC is variable, no
growth at 10 ºC. Grow on media: Trypticase soy agar with defibrinated sheep blood.
Growth is enhanced in a low oxygen atmosphere.
Human oral cavity inhabitant. Isolated from teeth surface.
Human commensal associated with the development of tooth decay.
  1. Holt J.G., Krieg N.R., Sneath P.H.A., Staley J.T. and Williams S.T., 1994. Bergey's Manual of Determinative Bacteriology, Ninth
    Edition, Williams & Wilkins, A Waverly Company, Baltimore, pp 527-558.
  2. Robert A. Whiley and Jeremy M. Hardie, 2009. Genus I. Streptococcus Rosenbach 1884, 22AL. In: (Eds.) P.D. Vos, G. Garrity, D.
    Jones, N.R. Krieg, W. Ludwig, F.A. Rainey, K.-H. Schleifer, W.B. Whitman. Bergey’s Manual of Systematic Bacteriology, Volume 3:
    The Firmicutes, Springer, 655-711.
  3. Coykendall A.L.: Streptococcus sobrinus nom. rev. and Streptococcus ferus nom. rev.: habitat of these and other mutans
    streptococci. Int. J. Syst. Bacteriol., 1983, 33, 883-885.
An adhesive glucan is produced from sucrose. Hydrogen peroxide is produced.

Positive results for alpha-glucosidase, Voges–Proskauer reaction, acid production from: cellobiose (delayed reaction), glucose,
maltose, mannitol (delayed reaction), mannose, sucrose, tagatose & trehalose.

Negative results for alkaline phosphatase, arginine hydrolysis, esculin hydrolysis, alpha-arabinosidase, alpha- or beta-
galactosidase, alpha- or beta-fucosidase, beta-glucosidase, beta-glucuronidase, N-acetylgalactosaminidase, N-
acetylglucosaminidase, pyrrolidonyl arylamidase, glycyl tryptophan arylamidase, hyaluronidase, sialidase, urease, acid production
from: adonitol, amygdalin, arabinose, arbutin, dulcitol, erythritol, esculin, gluconate, glycerol, glycogen, inositol, melibiose, methyl D-
glucoside, methyl D-mannoside, methyl D-xyloside, N-acetylglucosamine, melibiose, melizitose, pullulan, raffinose, rhamnose,
salicin, sorbose, starch & xylose.

Variable acid production from: galactose, lactose & sorbitol.
(c) Costin Stoica
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