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. 2025 Mar;31(3):547–554. doi: 10.3201/eid3103.241217

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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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Minimum-spanning tree of core-genome multilocus sequence type analysis of toxigenic Corynebacterium diphtheria, with 1,553 target loci of the whole-genome sequencing-obtained genomes of the toxigenic C. diphtheriae isolates from an outbreak in 2023 compared with genomes of an outbreak cluster of the same ST (ST574) from a previously reported outbreak among migrants (23). Single-linkage allelic distances are illustrated as a measure of genetic related. FaM, Frankfurt am Main; ST, sequence type.