A novel blaSIM-1-carrying megaplasmid pSIM-1-BJ01 isolated from clinical Klebsiella pneumonia

A rare carbapenem-resistant gene bla SIM-1 was found in a 316-kb megaplasmid designated pSIM-1-BJ01 isolated from a clinical strain Klebsiella pneumonia 13624. The plasmid pSIM-1-BJ01 was fully sequenced and analyzed. Its length is 316,557 bp and it has 342 putative open reading frames with two multidrug-resistant regions and a total of 19 resistant genes. Its backbone was highly homologous to the newly reported plasmid pRJA166a, which was isolated from a clinical third-generation cephalosporin-resistant hypervirulen strain K. pneumonia ST23. The plasmid pSIM-1-BJ01 was verified to be able to transfer to Escherichia coli . The emergency of the transferable bla SIM-1 -carrying multidrug-resistant plasmid pSIM-1-BJ01 suggests the spread of bla SIM among Enterobacteriaceae is possible. Therefore, the data presented herein provided insights into the genomic diversity and evolution of bla SIM -carrying plasmids, as well as the dissemination and epidemiology of bla SIM among Enterobacteriaceae in public health system.