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Two novel New Delhi metallo-β-lactamase-1 (NDM-1)-positive plasmids containing a complete composite transposon, Tn 125 , from two respective  Acinetobacter towneri  isolates were characterized. Plasmid pNDM-GJ01 (30,293 bp) isolated from  A .  towneri  G165 did not show homology to any known plasmid structure, except for the transposon Tn 125  containing  bla   NDM-1 . A novel  repB  gene and two XRE-type transcriptional regulators were found in pNDM-GJ01. Plasmid pNDM-GJ02 (62,011 bp) isolated from  A .  towneri  G295 showed the highest homology to pBJAB0715 (41% coverage, 99% nucleotide identity). In addition to the  bla   NDM-1 -harbouring transposon Tn 125 , pNDM-GJ02 also had an IS 26 -composite transposon, which contains IS CR1  and two class 1 integrons carrying different cassette arrays. Both clinical isolates were highly resistant to β-lactams and susceptible to tigecycline and colistin. Ten other resistance genes were detected in G295, and one other resistance gene was detected in G165. No transconjugant was obtained from any of the donors by broth and filter mating. The emergence of these two novel plasmids carrying NDM-1 in  Acinetobacter  spp., pNDM-GJ01 and pNDM-GJ02, suggests Tn 125  mobile integration.

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Complete sequences of two novel bla NDM-1-harbouring plasmids from two Acinetobacter towneri isolates in China associated with the acquisition of Tn125