Table 1 Distribution of MIC values and occurrence of resistance in E. coli from pigs

 Tetracycline

73.3

255

3

3

9

197

511

>32

>32

 Chloramphenicol

16.5

94

594

116

13

60

13

88

4

64

 Florfenicol

2.1

251

588

118

19

2

4

8

 Ampicillin

42.1

186

315

52

9

4

5

407

2

>32

 Amoxicillin + clavulanic acid

1.2

417

231

296

22

9

3

4

8

 Trimethoprim

37.5

610

1

1

366

4

>32

 Sulfonamide

68.3

273

5

32

86

84

498

>1024

>1024

 Streptomycin

69.8

162

73

60

121

161

401

64

>64

 Gentamicin

8.1

886

5

8

33

32

9

5

≤1

≤1

 Neomycin

31.3

660

9

3

31

89

186

≤2

>32

 Apramycin

8.2

858

37

3

1

25

54

≤4

8

 Ciprofloxacin

0.5

886

16

21

44

6

2

3

≤0.03

≤0.03

 Nalidixic acid

0.0

369

527

3

6

23

50

8

8

 Colistin

967

4

1

6

≤4

≤4

 Spectinomycin

0.0

360

69

66

107

251

125

64

>256

 Tetracycline

68.8

200

7

9

3

92

382

>32

>32

 Chloramphenicol

14.0

35

401

150

10

46

17

34

4

32

 Florfenicol

3.4

92

461

116

17

3

4

4

8

 Ampicillin

49.2

154

182

16

1

2

338

4

>32

 Amoxicillin + clavulanic acid

1.3

283

150

228

23

9

4

8

 Trimethoprim

47.2

333

3

30

1

326

4

>32

 Sulfonamide

67.4

217

8

1

5

462

>1024

>1024

 Streptomycin

71.9

160

35

69

76

114

239

128

>128

 Gentamicin

7.4

448

178

15

1

8

17

26

≤0.5

1

 Neomycin

14.7

565

19

6

9

16

77

≤2

>32

 Apramycin

6.9

531

105

9

1

47

≤4

8

 Ciprofloxacin

0.1

492

160

9

1

24

3

1

2

1

≤0.15

0.03

 Nalidixic acid

4.8

653

5

2

2

11

20

≤4

≤4

 Colistin

7.0

637

5

49

≤1

≤1

 Spectinomycin

51.8

233

43

58

50

90

219

128

>256

 Tetracycline

69.0

298

10

10

6

77

625

>32

>32

 Chloramphenicol

13.9

38

581

242

22

56

39

48

4

32

 Florfenicol

5.2

92

688

193

18

4

4

27

4

8

 Ampicillin

48.3

256

232

39

1

2

4

492

4

>32

 Amoxicillin + clavulanic acid

2.0

437

190

335

43

21

4

8

 Trimethoprim

46.2

542

4

2

4

1

473

≤1

>32

 Sulfonamide

67.4

321

13

2

8

682

>1024

>1024

 Streptomycin

70.9

243

55

58

85

110

475

128

>128

 Gentamicin

8.8

657

254

23

2

11

34

45

≤0.5

2

 Neomycin

9.6

874

44

9

5

16

78

≤2

8

 Apramycin

7.8

810

129

7

80

≤4

8

 Ciprofloxacin

0.1

468

317

19

185

24

10

2

1

0.03

0.125

 Nalidixic acid

3.4

980

8

3

1

10

24

≤4

≤4

 Colistin

1.8

1002

6

7

7

1

3

≤1

≤1

 Spectinomycin

50.2

328

100

83

54

103

358

128

>256

 Tetracycline

67.8

17

2

40

>32

>32

 Chloramphenicol

25.4

2

39

3

3

12

4

64

 Florfenicol

11.9

7

40

5

1

1

5

4

8

 Ampicillin

50.8

8

19

2

30

32

>32

 Cefotaxime

1.7

58

2

≤0.25

≤0.25

 Trimethoprim

47.5

31

1

27

≤1

32

 Sulfonamide

69.9

18

41

>1024

>1024

 Streptomycin

67.8

16

2

7

9

24

64

128

 Gentamicin

6.8

42

12

1

4

≤0.5

1

 Neomycin

11.9

49

3

7

≤2

32

 Apramycin

6.8

53

2

4

≤4

8

 Ciprofloxacin

0.0

49

4

5

1

≤0.015

0.25

 Nalidixic acid

10.2

53

6

≤4

64

 Colistin

0.0

59

≤1

≤1

 Spectinomycin

42.4

27

4

3

4

21

32

256

 Tetracycline

62.5

26

1

2

43

>32

>32

 Chloramphenicol

23.6

36

17

2

3

1

13

4

>64

 Florfenicol

18.1

3

37

19

13

4

>64

 Ampicillin

45.8

5

31

3

1

32

2

>64

 Cefotaxime

2.8

70

2

≤0.25

≤0.25

 Trimethoprim

55.6

32

40

>32

>32

 Sulfonamide

61.1

28

1

43

>1024

>1024

 Streptomycin

77.8

15

1

12

6

12

26

128

>128

 Gentamicin

9.8

58

7

3

3

1

≤0.5

1

 Neomycin

13.9

62

1

9

≤2

>64

 Apramycin

9.8

63

2

7

≤4

8

 Ciprofloxacin

0.0

50

7

1

11

3

≤0.15

0.25

 Nalidixic acid

19.4

56

2

14

≤4

64

 Colistin

1.4

71

1

≤1

≤1

 Spectinomycin

59.9

27

1

3

15

26

256

>256

 Ceftiofur

1.4

70

1

1

≤0.5

≤0.5