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Phylogeny obtained based on 1,896 nt positions from the three housekeeping genes rpoB, gyrA, and gapDH. The neighbor-joining tree was rooted using K. pneumoniae type strain SB132 (= ATCC 13883T). Values at the nodes correspond to bootstrap values obtained after 1,000 replicates. Five branches of K. oxytoca are distinguished, corresponding to phylogenetic groups KoI to KoVI. blaOXY-5-harboring strains fall into the KoI branch.
