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Phylogenomic tree of the 43 E. coli strains. Blastp, perl, mcl, clustalW and MEGA were used to reconstruct the phylogenomic tree. The phylogenomic tree of different E. coli based on the comparison of 2043 core genes. The 43 E. coli strains are divided into five monophyletic phylogroups (A, B1, B2, D and E). The SLPE strains are highlighted in blackbody. SLPE is the closest relative to APEC 078
