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Table 1 In vitro activity of 10 antimicrobial agents against 78 bloodstream infection IRPA isolates

From: Overproduction of active efflux pump and variations of OprD dominate in imipenem-resistant Pseudomonas aeruginosa isolated from patients with bloodstream infections in Taiwan

Antibiotica

MIC (μg/mL)

% Susceptibility

Range

MIC50

MIC90

S

I

R

Cephems

 Ceftazidime

2–> 128

32

128

29.5

14.1

56.4

 Cefepime

2–> 64

32

64

21.8

16.7

61.5

Monobactam

 Aztreonam

2–> 64

32

64

24.4

21.8

53.8

Carbapenems

 Imipenem

16–256

32

64

0

0

100

 Meropenem

1–64

16

32

2.6

9.0

88.4

 Doripenem

1–128

16

32

3.8

0

96.2

Aminoglycosides

 Amikacin

≤1–> 64

8

32

85.9

5.1

9.0

 Gentamicin

≤1–> 256

8

256

33.3

23.1

43.6

Fluoroquinolones

 Ciprofloxacin

≤0.5–> 64

2

32

47.4

5.1

47.5

 Levofloxacin

≤0.5–> 128

4

64

42.3

9.0

48.7

  1. MIC50/90, minimum inhibitory concentration for 50 % and 90 % of the isolates, respectively; S, susceptible; I, intermediate resistant; R, resistant
  2. aAll isolates were susceptible to colisin, as determined by the disc diffusion method