Streptococcus orisratti
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus orisratti   Zhu
et al. 2000.
Lancefield group A.
Gram-positive cocci, nonmotile, nonspore-forming, arranged in pairs or short chains.
Alpha-hemolytic on sheep blood agar, white, circular or irregular colonies; 0.5-1.0 mm
in diameter.
Facultatively anaerobic, optimal growth at 37.0 ºC. Grow at 45 ºC, not at 50 ºC.
Grows on: Trypticase soy agar with 5% defibrinated sheep blood, Brain Heart Infusion
with yeast extract. No growth in 6.5% NaCl media.
Isolated from tooth surface of laboratory rats (Sprague-Dawley rats).
Unknown (oral bacteria). Possible cariogenic activity.
  1. H. Zhu, M.D.P. Willcox and K.W. Knox: A new species of oral Streptococcus isolated from Sprague-Dawley rats, Streptococcus
    orisratti sp. nov. IJSEM Vol 50, 55-61.
  2. Hill J.E., Gottschalk M., Brousseau R., Harel J., Hemmingsen & Goh S.H. : Streptococcus suis serotypes 32 and 34, isolated from
    pigs, are Streptococcus orisratti. Vet. Microbiol., 2005, 107, 63-69.
  3. 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.
Most of the biochemical characteristics were tested on API commercial kits.

Positive results for esculin hydrolysis, starch  hydrolysis, acid production from amygdalin, arbutin, cellobiose, fructose, galactose,
glucosamine, glucose, glycogen, inulin, lactose, maltose, mannose, melibiose, raffinose, salicin, starch, sucrose & trehalose.

Negative results for hippurate hydrolysis, arginine hydrolysis, catalase, pyrrolidonyl-arylamidase, beta-glucuronidase, alpha &
beta-galactosidase, acid production from arabinose, mannitol, sorbitol & melezitose.
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