Streptococcus criceti
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus cricetus  
Coykendall 1977, correction
S. criceti  by Trüper and De’ Clari 1998.
Member of the "Mutans group".
Gram-positive cocci, grouped in  chains.
Nonhemolytic, smooth, round, 2-3 mm colonies on blood agar. Some strains may
produce alpha-hemolysis. 1 mm colonies, rough, heaped, often glossy and may be
surrounded by liquid containing soluble extracellular glucan on sucrose agar.
Grow at 37 ºC, no growth at 10 or 45 ºC.
Aerobic, grow better anaerobically (gas mixture of 90% air, 10% CO
2).
Media: Trypticase soy agar with 5% sheep blood, Trypticase soy agar with yeast
extract, Brain heart infusion medium.
Isolated from oral cavity - animal (wild rats & hamsters Cricetus cricetus - caries lesion ), rarely from human oral cavity.
Unknown (oral bacteria - may be involved in dental caries or gingival infections).
  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. Coyendall A.L.: Proposal to elevate the subspecies of Streptococcus mutans to species status, based on their molecular
    composition. International Journal of Systematic Bacteriology, 1977, 27, 26-30.
  4. Truper H.G. & De’ Clari L.: Taxonomic note: erratum and correction of further specific epithets formed as substantives (nouns) "in
    apposition". Int. J. Syst. Bacteriol., 1998, 48, 615.
  5. Fitzgerald RJ, Keyes PH. Demonstration of the etiologic role of streptococci in experimental caries in the hamster. J. Am. Dent.
    Assoc. 61: 9-19, 1960.
Positive results for Voges-Proskauer test, acidification of N-acetylglucosamine, amygdalin, arbutin, cellobiose, galactose, glucose,
inulin, lactose, maltose, mannitol, mannose, melibiose, raffinose, salicin, sorbitol, & sucrose (extracellular polysaccharide is
produced from sucrose). Esculin is usually hydrolyzed.

Negative results for arginine hydrolysis, H
2O2 production, hippurate hydrolysis, starch hydrolysis, urease, acidification of arabinose,
glycerol, glycogen, melezitose, methyl D-glucoside, rhamnose, ribose, starch & xylose.

Variable results for acidification of lactose & trehalose.
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