Unknown.
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Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
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References
Firmicutes => Bacilli => Lactobacillales => Streptococcaceae => Streptococcus => Streptococcus cristatus corrig. Handley et al. 1991.
Old synonym: Streptococcus crista Handley et al. 1991.
Old synonym: Streptococcus crista Handley et al. 1991.
Gram-positive cocci, 1 µm in diameter, grouped in chains. Cells have tufts of fibrils in
a lateral position.
a lateral position.
Colonies grown at 37 °C for 2 days on blood agar are greyish white, glossy, entire,
alpha-hemolytic, and 1 to 2 mm in diameter.
Glucan production on sucrose-containing medium is a variable characteristic.
Grow at 37°C in brain heart infusion broth supplemented with 0.3% (wt/vol) added
yeast extract or on blood agar with 5% defibrinated horse blood.
alpha-hemolytic, and 1 to 2 mm in diameter.
Glucan production on sucrose-containing medium is a variable characteristic.
Grow at 37°C in brain heart infusion broth supplemented with 0.3% (wt/vol) added
yeast extract or on blood agar with 5% defibrinated horse blood.
Isolated from human throats and oral cavities. Salivary alpha-amylase is bound.
- Handley P., Coykendall A., Beighton D., Hardie J.M. & Whiley R.A.: Streptococcus crista sp. nov., a viridans streptococcus with
tufted fibrils, isolated from the human oral cavity and throat. Int. J. Syst. Bacteriol., 1991, 41, 543-547.
Positive for beta-N-acetylgalactosaminidase, beta-N-acetylglucosaminidase, alpha-
L-fucosidase, arginine hydrolysis, acid production from: arbutin, galactose, lactose,
maltose, trehalose & N-acetylglucosamine.
Negative for Voges-Proskauer test, catalase, esculin hydrolysis, urea hydrolysis, alpha-arabinosidase, beta-fucosidase,
alpha-galactosidase, alpha-glucosidase, beta-glucosidase, sialidase (neuraminidase), alkaline phosphatase, acid production from:
amygdalin, arabinose, inulin, lactulose, pullulan, mannitol, melibiose, melezitose, raffinose, rhamnose, ribose, sorbose, sorbitol,
tagatose, turanose & xylitol.
Variable for beta-galactosidase.
L-fucosidase, arginine hydrolysis, acid production from: arbutin, galactose, lactose,
maltose, trehalose & N-acetylglucosamine.
Negative for Voges-Proskauer test, catalase, esculin hydrolysis, urea hydrolysis, alpha-arabinosidase, beta-fucosidase,
alpha-galactosidase, alpha-glucosidase, beta-glucosidase, sialidase (neuraminidase), alkaline phosphatase, acid production from:
amygdalin, arabinose, inulin, lactulose, pullulan, mannitol, melibiose, melezitose, raffinose, rhamnose, ribose, sorbose, sorbitol,
tagatose, turanose & xylitol.
Variable for beta-galactosidase.
(c) Costin Stoica
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