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Core phylogeny of emm1 sequence type ST28 lineage, average distance 45 SNPs (all 1619 characterized). PBP2x types of this lineage associated with reduced beta-lactam susceptibility and represented by 15 or more isolates were characterized. Figure depicts three distinct tight phylogenetic clusters of PBP2x10, PBP2x18, and PBP2x47 collected within multiple years and states.
