Skip to main content

Table 5 MICs distribution of 10 antibiotics for the 9 enterococcal strains

From: Antimicrobial activity, antibiotic susceptibility and virulence factors of Lactic Acid Bacteria of aquatic origin intended for use as probiotics in aquaculture

Antibiotics

Number of strains with the indicated MIC (mg/L)a

EFSA breakpoints (mg/L)b

 

0.06

0.12

0.25

0.5

1

2

4

8

16

32

64

128

256

512

1024

2048

 

Ampicillin

  

5

3

1

           

2

Vancomycin

   

9

            

4

Gentamicin

    

4

 

5

         

32

Kanamycin

       

1

 

2

4

2

    

1024

Streptomycin

      

1

 

3

5

      

128

Erythromycin

  

5

   

3

1

        

4

Tetracycline

    

9

           

4

Chloramphenicol

      

8

1

        

16

Linezolid

     

9

          

n.a.

Narasin

  

1

8

            

n.a.

  1. aMICs determined by a VetMIC test. The antibiotic dilution ranges were: 0.25-32 mg/L (ampicillin), 1-128 mg/L (vancomycin), 2-256 mg/L (gentamicin), 16-2048 mg/L (kanamycin), 8-1024 mg/L (streptomycin), 0.5-64 mg/L (erythromycin, tetracycline and chloramphenicol), 0.25-16 mg/L (linezolid) and 0.12-16 (narasin). MICs which exceeded the upper or lower limit of the tested range are listed in the next dilution series. MICs higher than the EFSA breakpoints are indicated in bold.
  2. bLAB with MICs higher than the EFSA breakpoints are considered as resistant strains [15]. n.a., not available.