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Acquisition of the  bla  NDM–  1  gene by  Proteus mirabilis  is a concern because it already has intrinsic resistance to polymyxin E and tigecycline antibiotics. Here, we describe a  P. mirabili s isolate that carries a pPrY2001-like plasmid (pHFK418-NDM) containing a  bla  NDM–  1  gene. The pPrY2001-like plasmid, pHFK418-NDM, was first reported in China. The pHFK418-NDM plasmid was sequenced using a hybrid approach based on Illumina and MinION platforms. The sequence of pHFK418-NDM was compared with those of the six other pPrY2001-like plasmids deposited in GenBank. We found that the multidrug-resistance encoding region of pHFK418-NDM contains ΔTn 10  and a novel transposon Tn 6625 . Tn 6625  consists of ΔTn 1696 , Tn 6260 , In251, ΔTn 125  (carrying  bla  NDM–  1 ), ΔTn 2670 , and a novel  mph (E)-harboring transposon Tn 6624 . In251 was first identified in a clinical isolate, suggesting that it has been transferred efficiently from environmental organisms to clinical isolates. Genomic comparisons of all these pPrY2001-like plasmids showed that their relatively conserved backbones could integrate the numerous and various accessory modules carrying multifarious antibiotic resistance genes. Our results provide a greater depth of insight into the horizontal transfer of resistance genes and add interpretive value to the genomic diversity and evolution of pPrY2001-like plasmids.

Characterization of a NDM-1- Encoding Plasmid pHFK418-NDM From a Clinical Proteus mirabilis Isolate Harboring Two Novel Transposons, Tn6624 and Tn6625