Fig. 1: Phylogenetic analysis of Y. pestis in Inner Mongolia.

A maximum likelihood tree was constructed based on 8246 SNP sites identified from the core genome (present in 95% of strains) of 2021 Y. pestis genomes, including 585 genomes from Inner Mongolia and 1436 from other regions or countries. The innermost ring denotes the phylogroup, followed by the isolation location (Geographic area), the isolation time (Year). The phylogroups associated with Inner Mongolia strains are highlighted in shaded areas, with colors and labels corresponding to each group. To expand the definition of the rest of the tree, the very long branch containing the Angola strain (0.PE3) was truncated.