A neighbor-joining tree of 84 carbapenemase-producing Enterobacterales isolates carrying bla_IMP genes. This tree was constructed from average nucleotide distances between genomic sequences and was midpoint rooted. The color at the end of each branch indicates the bacterial species identity for that isolate. The innermost ring indicates the type of plasmid detected; the second ring, the allelic variant of the bla_IMP gene detected; the third ring, the presence or absence of gene mcr-9; and the outermost ring, hospitals. The scale bar indicates the pairwise average nucleotide divergence (as a percentage). Abbreviation: IMP, imipenemase.