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Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Firmicutes => Bacilli => Lactobacillales => Streptococcaceae => Streptococcus => Streptococcus orisratti Zhu et al. 2000.
Lancefield group A.
Lancefield group A.
Gram positive cocci, non-motile, non-spore-forming, arranged in pairs or short chains.
Alpha-haemolytic on sheep blood agar, white, circular or irregular colonies; 0.5-1.0
mm in diameter.
Facultatively anaerobic, optimal growth at 37.0 °C. Growat 45 °C but not at 50°C.
Growth on : Trypticase soy agar with 5% defibrinated sheep blood, Brain Heart
Infusion with yeast extract .
mm in diameter.
Facultatively anaerobic, optimal growth at 37.0 °C. Growat 45 °C but not at 50°C.
Growth on : Trypticase soy agar with 5% defibrinated sheep blood, Brain Heart
Infusion with yeast extract .
Isolated from laboratory rats (Sprague-Dawley rats).
Unknown (oral bacteria). Possible cariogenic activity.
- 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. - 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.
Acid is produced from galactose, glucose, fructose, mannose, glucosamine,
amygdalin, arbutin, salicin, cellobiose, maltose, lactose, melibiose, sucrose,
trehalose, inulin, raffinose, starch & glycogen.
Acid not produced from arabinose, mannitol, sorbitol & melezitose.
Aesculin & starch are hydrolysed. Hyppurate & arginine are not hydrolysed.
Catalase,pyrrolidonylarylamidase, beta-Glucuronidase, alpha & beta-Galactosidase
negative. (Most of biochemical characteristics were tested on API commercial kits.)
amygdalin, arbutin, salicin, cellobiose, maltose, lactose, melibiose, sucrose,
trehalose, inulin, raffinose, starch & glycogen.
Acid not produced from arabinose, mannitol, sorbitol & melezitose.
Aesculin & starch are hydrolysed. Hyppurate & arginine are not hydrolysed.
Catalase,pyrrolidonylarylamidase, beta-Glucuronidase, alpha & beta-Galactosidase
negative. (Most of biochemical characteristics were tested on API commercial kits.)
(c) Costin Stoica
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