Streptococcus oligofermentans
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Firmicutes, Class Bacilli, Order Lactobacillales, Family Streptococcaceae, Genus Streptococcus, Streptococcus
oligofermentans  
Tong et al. 2003. Member of the "Mitis group".

According to Jensen et al. (2016), this species is a later heterotypic synonym of
Streptococcus cristatus corrig. Handley et al. 1991.
Gram-positive cocci, nonmotile, nonspore-forming, 0.7 um in diameter, arranged in
short chains.
Alpha-hemolytic, rough, dark yellow,  0.5-1.0 mm in diameter colonies (24 h).
Facultatively anaerobic, optimal growth at 37.0 ºC. Growth at 10 & 45 ºC is negative.
Growth on : trypticase soy agar with defibrinated sheep blood, BHI blood agar. Range
of pH for growth is 5.3-8.95; optimum pH 7.0.
Isolated from dental plaque and saliva of caries-free humans.
Streptococcus oligofermentans may inhibit Streptococcus mutans through conversion of lactic acid into hydrogen peroxide.
Oral bacteria. May cause endocarditis.
  1. Tong H., Gao X. & Dong X.: Streptococcus oligofermentans sp. nov., a noval oral isolate from caries-free humans. Int. J. Syst. Evol.
    Microbiol., 2003, 53, 1101-1104.
  2. Huichun Tong; Wei Chen; Merritt Justin ; Fenqxia Qi; Wenyuan Shi; Xiuzhu Dong (1): Streptococcus oligofermentans inhibits
    Streptococcus mutans through conversion of lactic acid into inhibitory H2O2 : a possible counteroffensive strategy for interspecies
    competition. Molecular microbiology, 2007, vol. 63, no3, pp. 872-880.
  3. Matta M, Gousseff M, Monsel F, Poyart C, Diebold B, Podglajen I, Mainardi JL.: First case of Streptococcus oligofermentans
    endocarditis determined based on sodA gene sequences after amplification directly from valvular samples. J Clin Microbiol. 2009
    Mar;47(3):855-6.
  4. 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.
  5. Jensen A, Scholz CF, Kilian M. Re-evaluation of the taxonomy of the Mitis group of the genus Streptococcus based on whole
    genome phylogenetic analyses, and proposed reclassification of Streptococcus dentisani as Streptococcus oralis subsp. dentisani
    comb. nov., Streptococcus tigurinus as Streptococcus oralis subsp. tigurinus comb. nov., and Streptococcus oligofermentans as a
    later synonym of Streptococcus cristatus. Int J Syst Evol Microbiol 2016; 66:4803-4820.
Positive results for hydrolysis of hippurate, acid production from D-glucose, mannose,
maltose and sucrose. Glucose fermentation results exclusively in lactic acid production
which may be degraded to hydrogen peroxide (H
2O2).

Negative results for arginine hydrolysis, alkaline phosphatase, esculin hydrolysis, alpha- or beta-galactosidase, Voges-Proskauer
reaction, acid production from arbutin, amygdalin, arabinose, cellobiose, glycogen, inulin, melibiose, mannitol, ribose, salicin, sorbitol
and starch.

Acid production from lactose, trehalose and raffinose is variable.
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