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Table 3 Distribution (no. of isolates) of MIC values for 31 β-haemolytic streptococcal isolates of the 11 antibiotics tested. Vertical lines show the break points between sensitive (S), intermediate (I) and resistant (R) isolates. The S are to the left and the R 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

 

≤ 0,06

0,12

0,25

0,5

1

2

4

8

16

32

>32

  

Ampicillin

 

30

1

NT

NT

      

0,12–16

100 0 0

Cephalothin

      

31

    

4–16

100 0 0

Chloramphenicol

     

15

15

1

   

2–16

100 - 0

Clindamycin2

    

28

NT

3

    

1–4

90 0 10

Erythromycin3

   

31

       

0,5-4

100 0 0

Gentamicin

     

NT

6

9

10

6

 

1–16

19 29 52

Neomycin

     

1

NT

3

5

10

12

2–32

13 48 39

Oxytetracycline

    

9

NT

15

6

 

1

 

1–16

29 48 23

Penicillin G

31

 

NT

NT

 

NT

NT

    

0,06-8

100 0 0

Spiramycin4

      

31

    

4–32

100 - 0

Trimethoprim-sulphamethoxazole4,5

 

17

5

6

 

NT

NT

1

2

  

0.12-8

90 3 7

  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 All isolates equal to or less than 1 were regarded as S since this was the lowest concentration tested.
  3. 3 All isolates equal to or less than 0.5 were regarded as S since this was the lowest concentration tested.
  4. 4The vertical line shows the break point between S and Rt, no I-sensitivity is given.
  5. 5The MIC value for trimethoprim tested in combination with sulfamethoxazol (1:20) is given.
  6. NT = not tested, the titration step is not included in the VetMIC™ system.
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Acta Veterinaria Scandinavica

ISSN: 1751-0147