Key Findings

The study reports the complete nucleotide sequence of a 92-kilobase plasmid, pC15-1a, which harbors the CTX-M-15 extended-spectrum beta-lactamase, along with other resistance genes such as blaOXA-1, blaTEM-1, aac(6')-Ib, aac(3)-II, and tetA. These genes contribute to multidrug resistance in Escherichia coli strains associated with an outbreak in long-term-care facilities in Toronto, Canada.