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Phylogenetic tree by multilocus-sequence typing (MLST). Phylogenetic tree of 86 strains generated from analysis of high-quality single nucleotide polymorphisms (SNPs) and coloured by MLST. (a) Full tree, with two cohort outliers (samples 91 and 108676), Ox2183 and three Chinese strains. (b) The large, temporally indistinguishable main cluster, with reference CD305 and novel MLST strain OUS23024 indicated.
