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. 2024 Jan;30(1):29–38. doi: 10.3201/eid3001.221588

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Emerging Infectious Diseases is a publication of the U.S. Government. This publication is in the public domain and is therefore without copyright. All text from this work may be reprinted freely. Use of these materials should be properly cited.

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Maximum-likelihood phylogenetic tree of 4 Shanghai, China, and 1,491 global Bordetella pertussis strains, by geographic area, 2016–2022. Red lines indicate Shanghai strains; bold indicates 2 MT28 strains. Black dot indicates MT28-MRBP (B19005) strain from Anhui Province, China. Arrow indicates reference strain Tohama I. Shanghai strains associated phylogenetic subclades are enlarged for visualization. MSBP, macrolide-sensitive Bordetella pertussis; MT, multilocus variable-number tandem-repeat analysis type; NA, not applicable.