Fig. 1.

Minimum spanning tree based on allelic profiles obtained by MLST using a categorical coefficient. The 11 publicly available reference sequences have also been included (labelled in blue). Additionally, serotype data of significant clusters and encapsulated isolates are labelled. Each node represents a different ST, with the size of nodes proportional to the number of included isolates. Thick dark lines separate types differing by a single locus, while thin continuous lines connect double-locus variants. Faint lines represent types differing by three or more loci. Shading around nodes demonstrates partitioning of isolates differing by only one locus, and indicates designated CCs (1–8).