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Table 3 The percentage of isolates resistant to each of 12 antimicrobials (n = 544)

From: Antimicrobial use policy change in pre-weaned dairy calves and its impact on antimicrobial resistance in commensal Escherichia coli: a cross sectional and ecological study

Antimicrobial

No. resistant isolates

%

Tetracycline

501

92.1

Sulfisoxazole

468

86.0

Chloramphenicol

406

74.6

Kanamycin

402

73.9

Streptomycin

400

73.5

Trimethoprim/sulfamethoxazole

372

68.4

Ampicillin

322

59.2

Nalidixic acid

260

47.8

Gentamicin

175

32.2

Ceftiofur

148

27.2

Ciprofloxacin

138

25.4

Amikacin

15

2.8