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Table 6 In vitro susceptibility of 43 strains of Enterococcus sp. obtained from clinical and sub-clinical bovine mastitis cases from the West Littoral Region of Uruguay.

From: Antimicrobial Susceptibility of Udder Pathogens Isolated from Dairy Herds in the West Littoral Region of Uruguay

 

MIC1(μg/ml)

% Resistance

Antimicrobial Agent

MIC502

MIC903

Range

Breakpoint

VETMIC

Agar disk diffusion test

Penicillin

0.5

4

0.12–> 8

≥ 16

7.0

7.0

Ampicillin

0.5

4

≤ 0.12–16

≥ 16

2.3

2.3

Gentamicin

≤ 1

4

≤ 1–4

≥ 16

0.0

0.0

Erythromycin

≤ 0.5

≤ 0.5

≤ 0.5–4

≥ 8

4.6

4.6

Oxitetracycline

2

2

≤ 0.25–2

≥ 16

0.0

2.0 56

Trimethoprim/Sulfamethox.

> 8

> 8

1–> 8

≥ 4

97.7

....4....

  1. 1 Minimum inhibitory concentration. 2 Lowest concentration inhibiting 50% of the isolated tested.
  2. 3 Lowest concentration inhibiting 90% of the isolated tested. 4 Test not performed.
  3. 5No significant differences between methods. 6 Tetracycline disk were used to perform agar disks diffusion.
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Acta Veterinaria Scandinavica

ISSN: 1751-0147