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Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Firmicutes => Bacilli => Lactobacillales => Streptococcaceae => Streptococcus => Streptococcus ratti Coykendall 1977 (the original
spelling "rattus", has been corrected by Trüper and De' Clari 1997).
Basonym: S. mutans subsp. rattus Coykendall 1974.
spelling "rattus", has been corrected by Trüper and De' Clari 1997).
Basonym: S. mutans subsp. rattus Coykendall 1974.
Gram positive, slightly elongated cocci, 0.5 μm in diameter, occurring in pairs and
chains.
chains.
Colonies on agar containing sucrose are ca. 1 mm in diameter, rough, and heaped,
and may have beads or puddles of liquid (containing glucan) around. Colonies on
Trypticase-soy agar are gray-white and opaque, with a raised center.
Alpha hemolytic on blood agar.
Growth at 37.0 °C, can grow at 45 but not at 10 °C. Growth occurs in air and is
enhanced in low oxygen atmosphere. A pH of 4.2 to 4.4 was produced from
carbohydrates. Intolerant of 40% bile and 6.5% NaCl.
and may have beads or puddles of liquid (containing glucan) around. Colonies on
Trypticase-soy agar are gray-white and opaque, with a raised center.
Alpha hemolytic on blood agar.
Growth at 37.0 °C, can grow at 45 but not at 10 °C. Growth occurs in air and is
enhanced in low oxygen atmosphere. A pH of 4.2 to 4.4 was produced from
carbohydrates. Intolerant of 40% bile and 6.5% NaCl.
First isolated from a laboratory rat which may have been infected through contact with humans. Not found in wild rats.
Unknown.
- Bergey’s Manual of Determinative Bacteriology, 9th ed., 1994.
- Coykendall 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.]
Voges-Proskauer reaction, hydrolysis of esculin, ADH, mannitol, sorbitol, lactose,
trehalose, inulin, raffinose & salicin = positive.
Hydrolysis of hippurate & starch = negative. Glycerol, melezitose, rhamnose & xylose not fermented.
trehalose, inulin, raffinose & salicin = positive.
Hydrolysis of hippurate & starch = negative. Glycerol, melezitose, rhamnose & xylose not fermented.
(c) Costin Stoica
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