Article
Phylogenetic distribution of streptococcal superantigen SSA allelic variants provides evidence for horizontal transfer of ssa within Streptococcus pyogenes.
Infection and immunity - 1 Apr 1996
Reda K B, Kapur V, Goela D, Lamphear J G, Musser J M, Rich R R
Abstract excerpt
Phylogenetic analyses recently found the gene encoding the streptococcal superantigen SSA of Streptococcus pyogenes to occur in several well-differentiated clones comprising 10 (12.5%) of 80 clonal lineages examined. To determine if distinct clonal lineages carried the same ssa coding sequence or harbored a group of allelic variants, ssa was sequenced from 23 S. pyogenes strains representing the 10 clones...
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