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Neighbor-Net graph of all Neisseria meningitidis ST-23 clonal complex core genomes in the PubMLST database (n = 434) constructed with 767 of 1,600 core genes. Sublineages 23.1, 23.2, and 23.3 are shown in yellow, rust, and gray, respectively. The most common invasive N. meningitidis serogroup Y strain types (characterized by 12 genes) in Sweden, YI, YII, YIII (9, 12), and YIV, are found among the isolates within the dashed circles.
