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Mid-point rooted phylogeny of mcr-1-bearing E. coli strains. (A) Strains isolated before 1 December 2017 were labelled with grey backgrounds. MLST, O and H serotypes, the presence of antimicrobial resistance genes (AMR) encoding ESBLs, carbapenemases, and MCR-1 were plotted. Year of isolation for each strain was denoted after the dash line.
