Table 1

Antibiogram of 13 Escherichia coli strains isolated from faeces cultured on CHROMagar orientation with cefotaxime

AntibioticCut-off12345678910111213
Beta-lactam antibiotics
 Ampicillin>8>64>64>64>64>64>64>64>64>64>64>64>64>64
 Cefotaxime>0.2522>442222>4>4>4>4>4
 Ceftazidime>0.52828444222222
 Meropenem>0.125<0.03<0.03<0.03<0.03<0.03<0.03<0.03<0.03<0.03<0.03<0.03<0.03<0.03
Quinolones
 Ciprofloxacin>0.06<0.0150.25<0.015<0.0150.03<0.015<0.015<0.0158<0.0150.5<0.015<0.015
 Nalidixic acid>16<4<48<4<4<4<4<4>128<416<4
Amphenicols
 Chloramphenicol>16<8<8<8<8<8<8<8<8>128<8128<8<8
Polymyxins
 Colistin>2<1<1<12<1<1<1<1<1<1<1<1<1
Aminoglycosides
 Gentamicin>211<0.5<0.5<0.51<0.51<0.5<0.5<0.5<0.51
Macrolides
 Azithromycin>168328888168164848
Tetracyclines
 Tetracycline>8<2<2<2<24<2>64<2>64<264<2<2
 Tigecycline>0.5<0.25<0.25<0.25<0.25<0.25<0.25<0.25<0.25<0.25<0.25<0.25<0.25<0.25
Sulfonamides and trimethoprim
 Sulphamethoxazole>641616>10243216161632>1024>1024<8>1024>1024
 Trimethoprim>20.5>320.50.51111>320.5>320.51
  • Strain no. 5 originated from a dog fed dry kibble, the others from dogs that received RMBD.

  • EUCAST, European Committee on Antimicrobial Susceptibility Testing; MIC, minimum inhibitory concentration; RMBD, raw meat-based diet.