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1Laboratory of Microbiology, University of Ghent, Ghent
3BCCM/LMG Culture Collection, University of Ghent, Ghent
5Faculty of Sciences, and Laboratory of Microbiology, Faculty of Veterinary Medicine, University of Ghent, Ghent
2Laboratory of Medical Microbiology, University Hospital Antwerp UIA, Antwerp, Belgium
4Department of Clinical Bacteriology, University of Göteborg, Göteborg, Sweden
* Corresponding author. Mailing address: Laboratorium voor Microbiologie, Ledeganckstraat 35, B-9000 Ghent, Belgium. Phone: (32)9.264.51.14. Fax: (32)9.264.53.46. Electronic mail address: PeterVandamme{at}rug.ac.be.
ABSTRACT
Streptococcus dysgalactiae consists of at least five distinct subgroups on the basis of serogroups, biotypes, and hosts. A chemotaxonomic and phenotypic examination of 80 S. dysgalactiae strains representing the known diversity within this species and 49 reference strains representing all members of the streptococcal pyogenic species group revealed two subpopulations of strains within S. dysgalactiae. The name S. dysgalactiae subsp. dysgalactiae is proposed for strains of animal origin. These strains belong to Lancefield serogroups C and L, are alpha-, beta-, or nonhemolytic, and do not exhibit streptokinase activity on human plasminogen or proteolytic activity on human fibrin. The name S. dysgalactiae subsp. equisimilis is proposed for human isolates. These strains belong to Lancefield serogroups C and G, are beta-hemolytic, and exhibit streptokinase activity on human plasminogen and proteolytic activity on human fibrin.
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