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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 asStreptococcus 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.

Characterization of Blood Culture Isolates of Streptococcus dysgalactiae subsp. equisimilis Possessing Lancefield's Group A Antigen