Plasmid-Encoding Extended-Spectrum β-Lactamase CTX-M-55 in a Clinical Shigella Sonnei Strain, China

Plasmid p1081-CTXM was a close variant of the IncI2-type plasmid pHN1122-1 that was harbored in a faecal E. coli strain recovered from a dog in China, indicating the potential transfer of CTX-M-55-encoding plasmids from faecal flora E. coli to human pathogen S. sonnei.