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Streptococcus difficile is a nonhemolytic group B, type Ib Streptococcus

P Vandamme1, L A Devriese, B Pot

  • 1Laboratory of Microbiology, Faculty of Sciences, Faculty of Veterinary Medicine, University of Ghent, Belgium. Peter.Vandamme@rug.ac.be

International Journal of Systematic Bacteriology
|January 1, 1997
PubMed
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The type strain of Streptococcus difficile is indistinguishable from Streptococcus agalactiae. This organism is identified as a group B Streptococcus, specifically type Ib, with biochemical characteristics similar to strains from cold-blooded animals.

Area of Science:

  • Microbiology
  • Bacteriology
  • Molecular Biology

Background:

  • The classification and identification of bacterial species are crucial for understanding microbial ecology and disease pathogenesis.
  • Streptococcus difficile was initially described as a distinct species, but its precise taxonomic position has been subject to investigation.

Purpose of the Study:

  • To re-evaluate the taxonomic status of the type strain of Streptococcus difficile (LMG 15799) using whole-cell protein electrophoresis.
  • To determine the serological and biochemical characteristics of this strain for accurate classification.

Main Methods:

  • Whole-cell protein electrophoretic analysis was performed on the type strain LMG 15799.
  • Serological typing was conducted to identify the capsular polysaccharide antigen group.

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  • Biochemical reactivity profiling was compared with known Streptococcus agalactiae and other group B streptococcal strains.

    • Main Results:

    • Whole-cell protein electrophoresis showed that Streptococcus difficile LMG 15799 is indistinguishable from Streptococcus agalactiae.
    • The strain was identified as a group B Streptococcus, belonging to the capsular polysaccharide antigen type Ib.
    • Biochemical analysis revealed less versatility compared to typical S. agalactiae, but similarity to group B, type Ib streptococci from poikilothermic animals.

    Conclusions:

    • The type strain of Streptococcus difficile (LMG 15799) should be reclassified as Streptococcus agalactiae, specifically a group B, type Ib strain.
    • This finding has implications for the taxonomy of streptococci and understanding the diversity of group B streptococci, particularly in non-mammalian hosts.