Figure 2

Minimum spanning tree of 62 STs from this study (red), 13 STs from human O157 STEC (blue), and 65 STs from human ‘top six’ non-O157 STEC (green). Each circle represents a ST, with the pie divided proportionally to the number of isolates in that ST from different sources. The number in a circle indicates the ST number. The numbers on connecting lines represent the number of allelic differences between two STs.