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A high content of resistance and virulence genes was detected in both isolates. The novel KPC-49 variant, an Arg-163-Ser mutant of blaKPC-3, was detected in the isolate with resistance to ceftazidime-avibactam. Cloning experiments revealed that blaKPC-49 gene increases ceftazidime-avibactam MIC and decreases carbapenem MICs when using a porin deficient Klebsiella pneumoniae strain as a host. Both blaKPC-3 and blaKPC-49 genes were located on the transposon Tn4401a as a part of an IncF [F1A2B20] plasmid. The emergence of novel blaKPC genes
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