Streptococcus criceti
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Firmicutes => Bacilli => Lactobacillales => Streptococcaceae => 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.
Non-hemolytic colonies. Growth at 37 °C, no growth at 10 °C. Aerobic, grow better
anaerobically (gas mixture of 90% air, 10% CO2). 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. Bergey’s Manual of Determinative Bacteriology, 9th ed., 1994.
  2. 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.
  3. 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.
  4. 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.
Urea, ADH - negative
Voges-Proskauer, acidification of mannitol, sorbitol, lactose, trehalose, raffinose,
salicin - positive.
Hydrolysis of esculin, inulin - variable
(c) Costin Stoica
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