Streptococcus ferus
Taxonomy
Morphology
Cultural characteristics
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Pathogenicity
References
Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus ferus (ex
Coykendall 1977) Coykendall 1983. Member of the "Mutans group". No reaction with Lancefield antisera.
Gram-positive, 0.5 μm in diameter, lanceolate coccobacilli, nonmotile, grouped in pairs
or chains.
Nonhemolytic, 1 mm in diameter, raised, pitting and somewhat adherent colonies.
Grow at 37 ºC, better anaerobically. Growth is slightly enhanced in the presence of 5%
CO
2 . No growth at 45 ºC or in 6.5% NaCl. The final pH in 1% glucose broth is 4.2 to
4.5. Grow on complex media: Trypticase soy agar with 5% sheep blood, Slanetz-
Bartley agar, Edwards agar. Cells precipitate in brain heart infusion broth and strains
are unable to grow in the presence of 6.5% NaCl or 20 μg/ml bacitracin. Growth
occurs in thepresence of 0.0013 g/l crystal violet plus 0.33 g/l thallous sulfate
(Edwards medium) and in the presence of 0.4 g/l sodium azide plus 0.1 g/l
tetrazolium chloride. Resistant to bile.
First isolated from sugarcane-consuming wild rats (oral cavity). Also isolated from pigs (nasal & oral samples).
Commensal of wild rats. Not reported in humans.
  1. 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.
  2. 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.
  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.
  4. Margo Baele, Luc A. Devriese, Marc Vancanneyt, Mario Vaneechoutte, Cindy Snauwaert, Jean Swings & Freddy Haesebrouck:
    Emended description of Streptococcus ferus isolated from pigs and rats. Int J Syst Evol Microbiol 53 (2003), 143-146.
  5. A L Coykendall and M L Freedman. Colonization and cariogenicity of Streptococcus ferus in rats. Infect Immun. 1981 April; 32(1):
    80-85.
  6. Kazuko Takada, Kazuhiko Hayashi, Yutaka Sato, and Masatomo Hirasawa. Streptococcus dentapri sp. nov., isolated from the wild
    boar oral cavity. Int J Syst Evol Microbiol April 2010 60:820-823.
Positive results for leucine arylamidase, beta-D-glucosidase, Voges-Proskauer reaction, acid production from: N-acetylglucosamine,
esculin, amygdalin, cellobiose, D-fructose, galactose, D-glucose, glycogen, beta-gentiobiose, lactose, D-mannose, maltose,
maltotriose, sucrose, salicin, starch & trehalose.

Negative results for arginine hydrolysis, hippurate hydrolysis, beta-glucuronidase, beta-galactosidase, pyrrolidonyl arylamidase, acid
production from: adonitol, D- or L-arabinose, D- or L-arabitol, dulcitol, erythritol, D- or L-fucose, gluconate, glycerol, inositol, 2- or
5-ketogluconate, D-lyxose, melezitose, methyl beta-glycoside, methyl alpha-D-glycoside, rhamnose, ribose, l-sorbose, D-turanose,
xylitol,  D- or L-xylose.

Variable results for alkaline phosphatase, alpha-galactosidase, acid production from: D-tagatose, arbutin, inulin, mannitol, melibiose,
D-raffinose & sorbitol.
(c) Costin Stoica
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