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Minimum-spanning tree of 283 Bordetella pertussis MTs, Shanghai, China, 2016–2022. A) Virulence genotype profiles; B) A2047G mutations; C) pre-2020 versus post-2020. Circle sizes indicate the number of each MT. Differences in the length and thickness of the lines linking 2 circles indicate differences in the number of variable-number tandem repeats between the 2 linked MTs. MT, multilocus variable-number tandem repeat analysis type.
