Prevalence of extended-spectrum cephalosporin-resistant Escherichia coli in a farrowing farm: ST1121 clone harboring IncHI2 plasmid contributes to the dissemination of blaCMY-2 oleh Hui eDeng, Hui eDeng, Hong-bin eSi, Shu-Yi eZeng, Shu-Yi eZeng, Jian eSun, Jian eSun, Liang-Xing eFang, Liang-Xing eFang, Run-shi eYang, Run-shi eYang, Ya-Hong eLiu, Ya-Hong eLiu, Ya-Hong eLiu, Xiao-Ping eLiao, Xiao-Ping eLiao