Table 3.:
Bacteriostatic Interactions Between Ampicillin Plus Ceftriaxone or Ertapenem Against Five Isolates of
Enterococcus faecalis
Highly Resistant to Aminoglycosides Using the Double Disk Diffusion and the in Broth MIC Methods
Disk Diffusion Synergism
MIC (mg/l)
Strain
A
C
E
A+C
A+E
A+C
a
A+E
b
2557
4
>256
32
-
-
2
2
2648
4
>256
64
-
-
2
2
2927
1
>256
32
++
-
2
2
2929
1
>256
16
++
-
0.5
0.5
2980
2
>256
16
++
-
2
2
A, ampicillin; C, ceftriaxone; E, ertapenem.
a
, MIC of ampicillin in Muller Hinton Broth with a fixed ceftriaxone concentration (10 mg/l).
b
, MIC of ampicillin in Muller Hinton Broth with a fixed ertapenem concentration (2 mg/l).