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Table 2 Distribution (no. of isolates) of MIC values for 104 Escherichia coli isolates of the 10 antibiotics tested. Vertical lines show the break points between sensitive (S), intermediate (I) and resistant (R). The S-isolates are to the left and the R-isolates to the right of the lines.

From: Uterine Microbiology and Antimicrobial Susceptibility in Isolated Bacteria from Mares with Fertility Problems

Antimicrobial tested

MIC (mg/L)

Range tested1

S-I-R % isolates

 

≤ 0,12

0,25

0,5

1

2

4

8

16

32

>32

  

Ampicillin2

    

20H1

50H2

19

3

11H2

 

2–16

86 3 11

Cephalothin

     

5

14

44H1

31H4

10

4–32

18 43 39

Chloramphenicol

    

4

22

71H5

6

1

 

2–16

94 6 1

Enrofloxacin

 

101H5

 

1

2

     

0,25-2

97 3 0

Gentamicin

   

48H2

NT

52H3

 

3

1

 

1–16

96 0 4

Neomycin2

    

58H2

NT

38H3

1

2

4

2–32

93 3 4

Nitrofurantoin3

     

3

17

76H5

7

1

4–32

99 - 1

Oxytetracycline

   

6

NT

79H4

12H1

2

5

 

1–16

81 12 7

Streptomycin

    

1

NT

51H1

23H3

6

23H1

2–32

51 27 22

Trimethoprim-sulphamethoxazole3,4

79

NT

6H5

3

NT

NT

1

15

  

0,12-8

85 - 15

  1. 1 When the MIC value was above the range tested, the value for the next titration step (the value just above the range) was used.
  2. 2 One strain not tested.
  3. 3 The vertical line shows the break point between S and R, no I sensitivity is given.
  4. 4 The MIC value for trimethoprim tested in combination with sulfamethoxazol (1:20) is given. H1-5 The number of haemolytic E. coli isolates.
  5. NT = not tested, the titration step is not included in the VetMIC™ system.
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Acta Veterinaria Scandinavica

ISSN: 1751-0147