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Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Firmicutes => Bacilli => Lactobacillales => Streptococcaceae => Streptococcus => Streptococcus mutans Clarke 1924.
Member of the "Mutans group".
Member of the "Mutans group".
Gram positive cocci, 0.75 µm in diameter, arranged in medium-long chains,
non-motile.
non-motile.
Colonies are non-haemolytic, small, greywhite; become rough, heaped after 3-4 days;
1 mm diameter; hard to pick; “run along in front of needle”.
Facultatively anaerobic, optimal growth at 37.0 °C. Growth at 45 °C is variable.
Growth on : trypticase soy agar with defibrinated sheep blood.
1 mm diameter; hard to pick; “run along in front of needle”.
Facultatively anaerobic, optimal growth at 37.0 °C. Growth at 45 °C is variable.
Growth on : trypticase soy agar with defibrinated sheep blood.
Human oral cavity inhabitant. Was first isolated from a carious lesion.
Involved in tooth decay and dental plaque forming. Sucrose is utilized to produce a sticky, extracellular, dextran-based polysaccharide
that allows them to cohere to each other forming plaque. When associated with S. sobrinus, dental caries may have a higher
incidence, especially in children. May cause endocarditis.
that allows them to cohere to each other forming plaque. When associated with S. sobrinus, dental caries may have a higher
incidence, especially in children. May cause endocarditis.
- J. G.Holt et al., 1994. Begey’s manual of Determinative Bacteriology, 9th edition, Williams & Wilkins.
- MITSUGI OKADA, YOSHIKO SODA, FUMIKO HAYASHI, TAKAKO DOI, JUNJI SUZUKI, KAZUO MIURA & KATSUYUKI KOZAI: PCR
detection of Streptococcus mutans and S. sobrinus in dental plaque samples from Japanese pre-school children. J. Med.
Microbiol. — Vol. 51 (2002), 443–447. - Coykendall AL. Proposal to elevate the subspecies of Streptococcus mutans to species status, based on their molecular
composition. Int. J. Syst. Bacteriol. 27: 26-30, 1977. - Richard Facklam: What Happened to the Streptococci: Overview of Taxonomic and Nomenclature Changes. Clinical
Microbiology Reviews, October 2002, p. 613-630, Vol. 15, No. 4
Acid is produced from glucose, fructose, mannitol, sorbitol, lactose, trehalose, inulin,
raffinose, salicin, melibiose.
Acid is not produced from ribose.
Voges-Proskauer, hydrolysis of esculin, growth with 0.25% optocin - positive
Beta-Glucuronidase, beta-Galactosidase, alkaline phosphatase,
pyrrolidonearylamidase, hydrolysis of hippurate - negative.
Alpha-Galactosidase - variable.
raffinose, salicin, melibiose.
Acid is not produced from ribose.
Voges-Proskauer, hydrolysis of esculin, growth with 0.25% optocin - positive
Beta-Glucuronidase, beta-Galactosidase, alkaline phosphatase,
pyrrolidonearylamidase, hydrolysis of hippurate - negative.
Alpha-Galactosidase - variable.
(c) Costin Stoica
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