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Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Firmicutes => Bacilli => Lactobacillales => Streptococcaceae => Streptococcus =>
Streptococcus dysgalactiae subsp. dysgalactiae (ex Diernhofer 1932) Garvie et al. 1983
Streptococcus dysgalactiae subsp. equisimilis Vandamme et al. 1996
Lancefield group C.
Old synonyms: "Group II" Minett 1934, Streptococcus pseudogalactiae Plastridge and Hartsell 1937.
Streptococcus dysgalactiae subsp. dysgalactiae (ex Diernhofer 1932) Garvie et al. 1983
Streptococcus dysgalactiae subsp. equisimilis Vandamme et al. 1996
Lancefield group C.
Old synonyms: "Group II" Minett 1934, Streptococcus pseudogalactiae Plastridge and Hartsell 1937.
Gram-positive cocci, non-motile, grouped in short- to medium-length chains.
Alpha-hemolytic (subsp. dysgalatiae) or beta hemolytic (subsp. equisimilis)
colonies.Growth at 37.0°C, no growth at 10 or 45 °C. No growth at pH 9.6, in 10% bile
or in the presence of 6.5% NaCl. Require complex media: sheep blood agar, Brain
heart infusion agar or brain heart infusion broth.
colonies.Growth at 37.0°C, no growth at 10 or 45 °C. No growth at pH 9.6, in 10% bile
or in the presence of 6.5% NaCl. Require complex media: sheep blood agar, Brain
heart infusion agar or brain heart infusion broth.
Isolated from milk, clinical samples (human & animal).
Subsp. dysgalatiae - bovine mastitis, polyarthritis in lambs.
Subsp. equisimilis - septicemia, meningitis, endocarditis, pneumonia, skin & other various infections in dogs, pigs, horses, cattle &
humans also. May be a normal inhabitant of the respiratory tract.
Subsp. equisimilis - septicemia, meningitis, endocarditis, pneumonia, skin & other various infections in dogs, pigs, horses, cattle &
humans also. May be a normal inhabitant of the respiratory tract.
- Bergey’s Manual of Determinative Bacteriology, 9th ed., 1994.
- Garvie E.I., Farrow J.A.E. & Bramley A.J.: Streptococcus dysgalactiae (Diernhofer) nom. rev. Int. J. Syst. Bacteriol., 1983, 33, 404-
405. - Vandamme P., Pot B., Falsen E., Kersters K. & Devriese L.A.: Taxonomic study of Lancefield streptococcal groups C, G, and L
(Streptococcus dysgalactiae) and proposal of S. dysgalactiae subsp. equisimilis subsp. nov. Int. J. Syst. Bacteriol., 1996, 46,
774-781.
Litmus milk is usually reduced, acidified, and clotted. Catalase negative.
Acid is formed from glucose, lactose, maltose, sucrose & trehalose.
No acid is formed from raffinose, inulin, glycerol, or mannitol.
Esculin is not hydrolyzed. Some strains hydrolyze salicin.
Hippurate negative. Ammonia is formed from arginine. Hyaluronidase is usually
produced. ADH & beta-glucuronidase positive. VP & alpha-galactosidase negative.
Subsp. dysgalatiae is sorbitol variable & lactose positive.
Subsp. equisimilis is sorbitol negative & lactose variable.
Acid is formed from glucose, lactose, maltose, sucrose & trehalose.
No acid is formed from raffinose, inulin, glycerol, or mannitol.
Esculin is not hydrolyzed. Some strains hydrolyze salicin.
Hippurate negative. Ammonia is formed from arginine. Hyaluronidase is usually
produced. ADH & beta-glucuronidase positive. VP & alpha-galactosidase negative.
Subsp. dysgalatiae is sorbitol variable & lactose positive.
Subsp. equisimilis is sorbitol negative & lactose variable.
(c) Costin Stoica
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