Bacteria (no. of isolates)

Ceftazidime MIC50/90 (µg/ml)

Range

Ceftazidime avibactam MIC50/90 (µg/ml)

Range

Ceftazidime avibactam breakpoints susceptible/resistant (µg/ml)

Escherichia coli (29)

96.0/>256

8.0->256

0.5/1

0.016-2

≤8/4/≥16/4

Klebsiella pneumoniae (13)

64.0/>256

12.0->256

1.0/2

0.25-2

≤8/4/≥16/4

Enterobacter species (27)

32.0/256

0.38->256

0.5/1.5

0.19-3

≤8/4/≥16/4

Morganella morganii (1)

N/A

3

N/A

3

≤8/4/≥16/4

Citrobacter species (9)

N/A

1->256

N/A

0.94-1.5

≤8/4/≥16/4

Acinetobacter species (20)

>256/>256

0.75.0->256

24.0->256

0.75->256

N/A

Serratia marcescens (8)

N/A

1.0->256

N/A

0.064-192

≤8/4/≥16/4

Pseudomonas aeruginosa (24)

12/24

1.5->256

3.0/6

0.75-8

≤8/4/≥16/4

Klebsiella pneumoniae ATCC 700603 control

24

N/A

1

N/A

≤2/>16