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Abstract

Purpose. The emergence and spread of carbapenem-resistant hypervirulent Klebsiella pneumoniae (CR-hvKP) is causing worldwide concern, whereas NDM-producing hvKP is still rare. Here we report the complete genome sequence characteristics of an NDM-1-producing ST23 type clinical hvKP in PR China.

Methodology. Capsular polysaccharide serotyping was performed by PCR. The complete genome sequence of isolate 3214 was obtained using both the Illumina Hiseq platform and Pacbio RS platform. Multilocus sequence type was identified by submitting the genome sequence to mlst 2.0 and the antimicrobial resistance genes and plasmid replicons were identified using ResFinder and PlasmidFinder, respectively. Transferability of the bla NDM-1-bearing plasmid was determined by conjugation experiment, S1 pulsed-field gel electrophoresis and Southern hybridization.

Results. Isolate 3214 was classified to ST23 and belonged to the K1 capsular serotype. The isolate’s total genome size was 6 171 644 bp with a G+C content of 56.39 %, consisting of a 5 448 209 bp chromosome and seven plasmids. The resistome included 18 types of antibiotic resistance genes. Fourteen resistance genes including bla NDM-1 and bla CTX-M-14 were located on plasmids and five also including bla CTX-M-14 were in the chromosome. Plasmid pNDM_3214 carrying bla NDM-1 harboured six types of resistance genes surrounded by insertion sequences and was conjugative. The worldwide pLVPK-like virulence plasmid harbouring rmpA2 and rmpA was also found in this isolate.

Conclusion. This study provides basic information of phenotypic and genomic features of ST23 CR-hvKP isolate 3214. Our data highlights the potential risk of spread of NDM-1-producing ST23 hvKP.

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/content/journal/jmm/10.1099/jmm.0.000996
2019-05-20
2019-12-08
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