Conjugal Transfer, Whole-Genome Sequencing, and Plasmid Analysis of Four -Bearing Isolates from U.S. Patients.

Four clinical isolates bearing gene-harboring plasmids were characterized. All isolates demonstrated the ability to transfer colistin resistance to ; plasmids were stable in conjugants after multiple passages on nonselective media. was located on an IncX4 ( = 3) or IncN ( = 1) plasmid. The IncN plasmid harbored 13 additional antimicrobial resistance genes. Results indicate that the -bearing plasmids in this study were highly transferable and stable in the recipients.