Highlights
• A ST15 Klebsiella pneumoniae isolate co-harboring mcr-1.1, mcr-8.1 and ESBLs was first detected in laying hens.
• The pNXQY01-5 harbored the blaCTX-M-55 and mcr-1.1 genes linked to insertion sequences ISEc9 and ISApl1.
• The pNXQY01-2, pNXQY01-3, and pNXQY01-5 facilitated the horizontal transfer of resistance genes mcr-8.1, blaCTX-M-65, mcr-1.1 and blaCTX-M-55.
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