Table 3

Resistance patterns of bovine ESBL-producing E. coli isolates

Antimicrobial(s)No. (%) of isolates from:
Mixed dairy and beef cattle farms (n = 170)Beef cattle farms (n = 26)
SusceptibleIntermediateResistantSusceptibleIntermediateResistant
Ampicillin00170 (100)0026 (100)
Cefazolin00170 (100)0026 (100)
Cefuroxime00170 (100)0026 (100)
Cephalexin1 (0.6)0169 (99.4)1 (3.9)025 (96.2)
Cefotaxime1 (0.6)7 (4.1)162 (95.3)04 (15.4)22 (84.6)
Ceftazidime33 (19.4)82 (48.2)55 (32.4)10 (38.5)10 (38.5)6 (23.1)
Imipenem170 (100)0026 (100)00
Meropenem170 (100)0026 (100)00
Ertapenem170 (100)0025 (96.2)01 (3.9)
Aztreonam1 (0.6)26 (15.3)143 (84.1)1 (3.9)8 (30.8)17 (65.4)
Nitrofurantoin164 (96.5)0 (0)6 (3.5)23 (88.5)03 (11.5)
Gentamicin78 (45.9)5 (2.9)87 (51.2)22 (84.6)04 (15.4)
Tobramycin73 (42.9)097 (57.1)19 (73.1)07 (26.9)
Amikacin169 (99.4)1 (0.6)026 (100)00
Ciprofloxacin68 (40.0)2 (1.2)100 (58.8)22 (84.6)04 (15.4)
Trimethoprim-sulfomethoxazole48 (28.2)0122 (71.8)14 (53.8)012 (46.2)
Piperacillin-tazobactam141 (82.9)5 (2.9)24 (14.1)22 (84.6)04 (15.4)
Amoxicillin-clavulanic acid80 (47.1)090 (52.9)12 (46.2)014 (53.8)
Colistin170 (100)0026 (100)00
Fosfomycin169 (99.4)01 (0.6)23 (88.5)03 (11.5)