Molecular Characterization of an IncFII Plasmid Co-harboring and (A) Variant in a Clinical Isolate.

Carbapenems and tigecycline are two important classes of antimicrobial agents to treat the infections caused by Enterobacterales. Here, we reported a plasmid carrying both and (A) variant in clinical KP-1572. MIC results showed that KP-1572 was resistant to a wide range of antimicrobials. The and (A) variant were located on an identical plasmid, which was indicated by S1-PFGE and southern blotting hybridization and can be successfully transferred by electroporation. Whole-plasmid sequencing and analysis revealed that a 142,993-bp-sized plasmid, designated pIMP1572, contains an IncFII backbone and a variable region harboring and (A) variant. The plasmid pIMP1572 was apparently originated from a (A)-carrying IncFII plasmid but with a deletion length of 6,216-bp and a multiple drug resistance region (MDRR) insertion of 25,259 bp. The plasmid pIMP1572 in the present study represents the first report of the IncFII plasmid co-carrying and (A) variant, which should be monitored.