ampicillin (9.4-71.1%), trimethoprim/sulfamethoxazole (11.1-67.5%) and streptomycin (21.9-69.3%), whereas none were resistant to imipenem or amikacin.Resistance was detected, albeit at low frequency, to ESCs (bovine isolates, 1%; porcine isolates, 3%) and FQs (porcine isolates, 1%). Most ESC-and FQ-resistant isolates represented globally disseminated E. coli lineages (ST117, ST744, ST10 and ST1). Only a single porcine E. coli isolate (ST100) was identified as a classic porcine enterotoxigenic E. coli strain (non-zoonotic animal pathogen) that exhibited ESC resistance via acquisition of bla CMY-2 . This study uniquely establishes the presence of resistance to CIAs among clinical E. coli isolates from Australian foodproducing animals, largely attributed to globally disseminated FQ-and ESC-resistant E. coli lineages.