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Minimum spanning tree of invasive group B Streptococcus (GBS) isolates by serotype showing the relationship between ST and clonal complex CC by serotype. Circles represent STs; size of each circle indicates the number of isolates within the specific type. The ST with the greatest number of single-locus variants is the founder ST. GBS isolate serotypes appear as different colors; shading denotes STs belonging to the same CC. CC, clonal complex; ST, sequence type.
