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Table 2 Polymyxin synergy with imipenem, rifampicin and azithromycin by Etest – agar dilution

From: In-vitro activity of polymyxin B in combination with imipenem, rifampicin and azithromycin versus multidrug resistant strains of Acinetobacter baumannii producing OXA-23 carbapenemases

Strain

Imipenem MIC with polymyxin 0.25 × MIC (mg/L)

FICI

Rifampicin MIC with polymyxin 0.25 × MIC (mg/L)

FICI

Azithromycin MIC with polymyxin 0.25 x MIC (mg/L)

FICI

1

6

0.75

1.5

0.625

24

1

2

>32

1.00

1.5

0.625

>256

1

3

>32

1.00

2

0.75

>256

1

4

>32

1.00

1.5

0.625

>256

1

5

8

0.5

1

0.5

24

1