Fig. 3. Phylogenetic distribution and diversity of virulence genes.

The phylogenetic tree is identical to that in Fig. 1a. The colored lines extending out of the branches in the tree represent the ST. The outer rings numbered 1–28 represent the 28 SAg genes detected in the genomes. Red blocks indicate the presence of the SAg gene. The outermost ring shows the presence and types of the spa gene detected in the genomes. The gene names of SAg and the spa types are listed below the tree.