Background: VIM (Verona Integron-encoded Metallo-beta-lactamase) is a member of the Metallo-Beta-Lactamases (MBLs), and is able to hydrolyze all beta-lactams antibiotics, except for monobactams, and including carbapenems. Here we characterize a VIM-producing IncA plasmid isolated from a clinical ST69 Escherichia coli strain from an Italian Long-Term Care Facility (LTCF) inpatient. Methods: An antimicrobial susceptibility test and conjugation assay were carried out, and the transferability of the blaVIM-type gene was confirmed in the transconjugant. Whole-genome sequencing (WGS) of the strain 550 was performed using the Sequel I platform. Genome assembly was performed using "Microbial Assembly". Genomic analysis was conducted by uploading the contigs to ResFinder and PlasmidFinder databases. Results: Assembly resulted in three complete circular contigs: the chromosome (4,962,700 bp), an IncA plasmid (p550_IncA_VIM_1; 162,608 bp), harboring genes coding for aminoglycoside resistance (aac(6')-Ib4, ant(3″)-Ia, aph(3″)-Ib, aph(3')-XV, aph(6)-Id), beta-lactam resistance (blaSHV-12, blaVIM-1), macrolides resistance (mph(A)), phenicol resistance (catB2), quinolones resistance (qnrS1), sulphonamide resistance (sul1, sul2), and trimethoprim resistance (dfrA14), and an IncK/Z plasmid (p550_IncB_O_K_Z; 100,306 bp), free of antibiotic resistance genes. Conclusions: The increase in reports of IncA plasmids bearing different antimicrobial resistance genes highlights the overall important role of IncA plasmids in disseminating carbapenemase genes, with a preference for the blaVIM-1 gene in Italy.

Biomedical Center Faculty of Medicine in Pilsen Charles University 32300 Pilsen Czech Republic

Clinical Microbiology Laboratory ASP Golgi Redaelli Hospital Via Olmetto 20123 Milan Italy

Department of Clinical Surgical Diagnostic and Pediatric Sciences Unit of Microbiology and Clinical Microbiology University of Pavia 27100 Pavia Italy

Department of Microbiology Faculty of Medicine University Hospital in Pilsen Charles University 32300 Pilsen Czech Republic

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