FIG 4.

The phylogenetic tree of 857 K. pneumoniae strains based on the 483-kb recombination region. The tree was inferred using strain 090357 (accession number CP066523) as the reference. The phylogeny was inferred from core SNPs under a GTR model with site rate variation and a 100-bootstrap test. The tree was midpoint-rooted with bootstrap support of over 50% shown in gradients. The circles from the outer to the inner represent ST11-KL64 clades, KL64 or KL47 strains (regardless of STs), and ST11 or ST147 strains, respectively. The scale bar represents the number of nucleotide substitutions per site.