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Core-genome phylogeny of isolates belonging to CC ST-21 with isolate pairs and respective number of SNPs highlighted. The tree is rooted to the mid-point with isolate 9-40 used as a reference and a core-genome size of 915 331 bp - scale bar represents percentage of core genome size. Sequence types with more than one constituent isolate are annotated with coloured bars. The figure was generated using Parsnp [21] and iTOL [22].
