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Table 6 Antimicrobial susceptibility of E. coli and Klebsiella spp. isolated from bovine clinical mastitis

From: Udder pathogens and their resistance to antimicrobial agents in dairy cows in Estonia

 

E. coli

Klebsiella spp.

Disc content in μg

n

S*

(%)

I *

(%)

R*

(%)

n

S*

(%)

I*

(%)

R*

(%)

Ampicillin 10 μg

201

68.7

7.0

24.3

39

15.4

7.7

76.9

Cefaperazone75 μg

137

100

0

0

32

100

0

0

Tetracycline 30 μg

184

77.8

8.7

13.5

39

79.6

10.2

10.2

Trimethoprim/sulfa 1.25/23.75 μg

191

84.3

3.7

12.0

40

97.5

0

2.5

Gentamycin 10 μg

161

94.3

2.5

2.2

40

95.0

0

5.0

Streptomycin 300

μg

154

78.6

5.8

15.6

37

73.0

8.1

18.9

Neomycin 30 μg

155

72.9

20.6

6.5

37

83.8

13.5

2.7

Enrofloxacin 5 μg

185

98.4

0

1.6

37

100

0

0

  1. * Proportion of susceptible (S), intermediate susceptibility (I) and resistant (R) isolates