Fig 2.

Minimum evolution tree based on concatenated sequences of seven housekeeping genes and showing the position of the 112 strains of S. dysgalactiae, S. equi, S. canis, and S. pyogenes. The strains within the defined clusters are color labeled: S. dysgalactiae subsp. equisimilis subcluster 1, gray; S. dysgalactiae subsp. equisimilis subcluster 2, purple; S. dysgalactiae subsp. dysgalactiae subcluster 1, blue; S. dysgalactiae subsp. dysgalactiae subcluster 2, turquoise; S. pyogenes, yellow; S. canis, green; S. equi subspecies, orange. Open symbols, arrows, and designations indicate the positions on the tree of the type strains. S. dysgalactiae subsp. equisimilis and S. dysgalactiae subsp. dysgalactiae are both divided into two subclusters. Triangles indicate isolates from this study, while squares indicate sequences extracted from whole-genome sequences. Bootstrap values for major branches are shown.