[Objective]To sequence and analyze plasmid p1173-CTXM from the clinical multidrug-resistant Shigella sonnei isolate 1173 with the aim of investigating the mechanism of bla_(CTX-M-64 )resistance gene transfer.[Methods]A double-disk synergy test was conducted to determine if strain 1173 produced extended-spectrum beta-lactamase(ESBL),then antibiotic resistance genes were PCR-amplified and sequenced.Conjugation experiments were used to verify the transferability of plasmids carrying ESBL genes.The transconjuga...