Table 5

Phenotypic characteristics of S. dysgalactiae subsp. equisimilis, S. dysgalactiae subsp. dysgalactiae, and S. equi

Characteristic% of isolates positiveResulta
S. dysgalactiae subsp. equisimilisS. dysgalactiae subsp. dysgalactiaeS. equi (n = 13)S. canisS. pyogenes
Subcluster 1 (n = 51)Subcluster 2 (n = 10)Subcluster 1 (n = 12)Subcluster 2 (n = 3)
Lancefield group antigen
    A020000+
    C65083100100
    G3580000+
    L001700
Growth in TH mediumb
Flocculent881001006754NDND
Diffuse12003346NDND
Colony diam >1 mm10010010010092++
β-hemolysis961001000100++
α-hemolysis4001000
Hyaluronidase98100921000+
Salicin901050077++
Sorbitol20033100
Esculin hydrolysis695025077+d
Arginine hydrolysis100100100100100++
Voges-Proskauer (VP)1010808
β-Glucuronidase73100100100100dd
α-Galactosidase00000d
β-d-Glucosidase200023ND
Neuraminidase0025054NDd
β-Galactosidase (ONPG)100100100100100+
N-Acetyl-β-galactosaminidase00800NDND
β-Fucosidase78905000NDND
Pyrrolidonyl arylamidase (PYR)00000+
Bacitracin susceptibility142017023+
  • a Data are from Bergey's Manual of Systematic Bacteriology (55); d, different strains give different reactions; ND, not determined.

  • b TH, Todd-Hewitt broth.