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Case Reports
. 1999 Dec;37(12):4194-7.
doi: 10.1128/JCM.37.12.4194-4197.1999.

Characterization of blood culture isolates of Streptococcus dysgalactiae subsp. equisimilis possessing Lancefield's group A antigen

C M Brandt  1 , G Haase, N Schnitzler, R Zbinden, R Lütticken
Affiliations
Case Reports

Characterization of blood culture isolates of Streptococcus dysgalactiae subsp. equisimilis possessing Lancefield's group A antigen

C M Brandt et al. J Clin Microbiol. 1999 Dec.

Abstract

For three human blood culture isolates of beta-hemolytic streptococci with Lancefield's serogroup A antigen, phylogenetic analysis of the 16S rRNA genes confirmed biochemical identification as Streptococcus dysgalactiae subsp. equisimilis. Genes encoding M or M-like proteins, which are considered to be major virulence determinants in streptococci, were detected in all of these strains. Our data clearly demonstrate that for beta-hemolytic streptococci, the species assignment should not be based on the results of serogrouping alone.

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Figures

FIG. 1
FIG. 1
Ouchterlony immunodiffusion of cell wall carbohydrate extracts (outer wells) tested with rabbit antisera against the antigens A, C, G, and A-variant (central wells). 1, serogroup-specific control antigen; 2, AC-2074; 3, AC-2713; 4, AC-2832.
FIG. 2
FIG. 2
Rooted phylogenetic tree inferred by analysis of 16S rDNA sequences of the three blood culture isolates AC-2074, AC-2713, and AC-2832 and other members of the pyogenic streptococci by the neighbor-joining method. Bootstrap values of ≥975 are displayed; nodes with a support of <975 are drawn unresolved.
See this image and copyright information in PMC

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