Table 2 Comparison of the in vitro activities of selected antimicrobial agents tested against Klebsiella spp. ^a (329 strains)

 Cefuroxime

4

>16

≤2 – >16

62.3 / 32.2

 Cefoxitin

≤4

>16

≤4 – >16

82.6 / 11.8

 Ceftriaxone

≤0.25

32

≤0.25 – >32

63.8 / 35.2

 Ceftazidime

≤1

>16

≤1 – >16

66.8 / 33.1

 Cefepime

≤0.12

8

≤0.12 – >16

92.7 / 4.5

 Piperacillin/tazobactam 

2

>64

≤0.5 – >64

79.3 / 11.2

 Imipenem

0.25

0.5

≤0.12 – >8

98.4 / 1.2

 Meropenem

≤0.12

0.25

≤0.12 – >8

98.4 / 0.9

 Ciprofloxacin

≤0.03

>4

≤0.03 – >4

80.8 / 18.2

 Levofloxacin

≤0.5

>4

≤0.5 – >4

82.3 / 15.8

 Gentamicin

≤2

>8

≤2 – >8

82.6 / 14.5

 Amikacin

2

>32

≤4 – >32

84.1 / 13.1

 PolymyxinB 

≤0.5

≤0.5

≤0.5 – >4

99.2 / 0.6

 Colistin

≤0.5

≤0.5

≤0.5 – >4

99.5 / 0.4