A novel self-transmissible mega plasmid from extensively drug-resistant Klebsiella oxytoca carries multiple antimicrobial resistance genes and act as a resistance reservoir
Highlights • XDR Klebsiella oxytoca found in hospital wastewater with 59 resistance genes • Mega plasmid pKO611.1 carries 28 resistance genes, enabling multidrug resistance • Novel tet (E) variant and AmpC β-lactamase confer tetracycline & β-lactam resistance • Plasmid pKO611.1 transfers efficiently to Escherichia coli , spreading resistance • Plasmid recombination shows potential as resistance gene reservoir for dissemination