Figure 2. Minimum spanning tree representation of the relationships between 483 S. dysgalactiae isolates recovered from humans, horses and a dog.

Dashed lines indicate the division in three main groups, corresponding to a difference of at least six different loci. The size of each circle is proportional to the number of isolates with that particular ST on a logarithmic scale. Putative CC founders are identified by a light green circle and putative sub-founders by a light brown circle (see legend of Fig. 1). STs corresponding to the whole genome sequences available are indicated by a yellow dot.