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Core-genome maximum-likelihood phylogenetic tree of all P. aeruginosa isolates and the P. aeruginosa PAO1 reference genome. The units of the scale are single-nucleotide polymorphisms (SNPs) by position. Ceftazidime/avibactam (CZA) phenotypes of P. aeruginosa isolates are highlighted by shaded squares: resistant (black), susceptible (dark grey), and not applicable (light grey). CZA, ceftazidime/avibactam.
