Table 1.

Characteristics of the three ESBL-producing E. coli isolates and their blaCTX-M-carrying plasmids

IsolateAnimal speciesDisease conditionResistance patternaMLSTESBL geneESBL-carrying plasmidReplicon typeApproximate size (kb)Colocated resistancesa
168DogPneumoniaBLA, CHL, ENR, GEN, NEO, SMZ, SXT, TETST1576blaCTX-M-1pCTX168IncN50
246SwineMastitis-metritis-agalactia syndromeBLA, SMZ, SXT, TETST1153blaCTX-M-1pCTX246IncN50
913DogUrinary tract infectionBLA, CHL, ENR, GEN, NEO, SMZ, SXT, TETST410blaCTX-M-15pCTX913IncF50GEN, TET
  • a BLA, β-lactams; CHL, chloramphenicol; ENR, enrofloxacin; GEN, gentamicin; NEO, neomycin; SMZ, sulfamethoxazole; SXT, sulfamethoxazole-trimethoprim (19:1); TET, tetracycline.