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Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Firmicutes => Bacilli => Lactobacillales => Streptococcaceae => Streptococcus => Streptococcus gordonii Kilian et al. 1989.
Lancefield group H or non-groupable.
Lancefield group H or non-groupable.
Gram-positive cocci, non-motile, grouped in short chains.
Alpha-haemolytic colonies on horse blood agar. Growth temperature 37 °C. Aerobic,
facultatively anaerobic. May grow better in a CO2 enriched atmosphere (5%)
Growth on: Trypticase soy agar with defibrinated sheep blood.
Brain heart infusion agar or broth.
facultatively anaerobic. May grow better in a CO2 enriched atmosphere (5%)
Growth on: Trypticase soy agar with defibrinated sheep blood.
Brain heart infusion agar or broth.
Isolated from human oral cavity and pharynge. Report of isolation from patient with subacute bacterial endocarditis.
Commensal oral bacteria. May be involved in development of dental plaque & caries. Oral lesions may lead to bacterial endocarditis.
- Kilian M., Mikkelsen L. & Henrichsen J.: Taxonomic study of viridans streptococci: description of Streptococcus gordonii sp. nov.
and emended descriptions of Streptococcus sanguis (White and Niven 1946), Streptococcus oralis (Bridge and Sneath 1982),
and Streptococcus mitis (Andrewes and Horder 1906). Int. J. Syst. Bacteriol., 1989, 39, 471-484. - Richard J. Lamont, Azza El-Sabaeny, Yoonsuk Park, Guy S. Cook, J. William Costerton & Donald R. Demuth.: Role of the
Streptococcus gordonii SspB protein in the development of Porphyromonas gingivalis biofilms on streptococcal substrates
Voges-Proskauer, hydrolysis of hippurate & beta-Glucuronidase = negative.
Hydrolysis of esculin, alkaline phosphatase(PAL), arginine (ADH), urease & levan
production = positive.
Acid produced from lactose, trehalose & salicin. Acid not produced from melezitose,
mannitol & sorbitol.
Variable reactions: alpha & beta-Galactosidase, inulin, raffinose, starch hydrolysis.
Hydrolysis of esculin, alkaline phosphatase(PAL), arginine (ADH), urease & levan
production = positive.
Acid produced from lactose, trehalose & salicin. Acid not produced from melezitose,
mannitol & sorbitol.
Variable reactions: alpha & beta-Galactosidase, inulin, raffinose, starch hydrolysis.
(c) Costin Stoica
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