Table 3 MIC of the tested antibiotics on planktonic cells post single and combined treatments

Ceftazidime

32

16

Colistin

4

2

Gentamicin

16

8

Meropenem

16

8

Ceftazidime in combination with colistin

8

4

Colistin in combination with ceftazidime

1

0.5

Gentamicin in combination with meropenem

2

1

Meropenem in combination with gentamicin

2

1

*FICI Ceftazidime/Colistin

0.5

0.5

*FICI Gentamicin/Meropenem

0.25

0.25