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Table 2 Results for susceptibility tests and MICs for E. coli strains (n = 550) isolated from 30 county hospitals

From: Nationwide high prevalence of CTX-M and an increase of CTX-M-55 in Escherichia coli isolated from patients with community-onset infections in Chinese county hospitals

 

All isolates (n = 550)

ESBL-positive (phenotype) isolates (n = 249)

Antibiotic

MIC50 (mg/L)

MIC90 (mg/L)

Susceptible %

Resistant %

MIC50 (mg/L)

MIC90 (mg/L)

Susceptible %

Resistant %

Ampicillin

256

>256

13.6

85.1

>256

>256

0

100

Piperacillin

64

>256

31.8

49.5

256

>256

0

91

Ampicillin-Sulbactam

16

64

35

39.1

32

64

14.7

61.5

Piperacillin-tazobactam

8

16

91

2.1

8

32

86.5

4.5

Cefazolin

32

256

46.7

51.1

256

256

0.4

99.6

Cefuroxime

8

256

50.1

47.8

256

256

0

98.5

Ceftazidime

0.5

32

80.4

18.3

4

64

55.6

40.6

Ceftriaxone

0.25

128

55.4

44.2

64

128

0.7

98.5

Cefepime

1

32

77.7

13.5

8

64

54.5

28.9

Cefoxitin

4

32

76.9

15

8

128

61.8

24.7

Biapenem

0.064

0.125

100

0

0.064

0.125

100

0

Imipenem

0.125

0.25

100

0

0.125

0.25

100

0

Meropenem

0.064

0.125

100

0

0.064

0.125

100

0

Amikacin

2

8

93.6

6.1

2

64

89.1

10.2

Gentamicin

16

128

47.2

51.5

64

256

33.5

66.2

Ciprofloxacin

4

64

46.7

51

32

128

24.8

73.3

Levofloxacin

4

32

49.1

46.7

16

64

26.2

68.9

Fosfomycin

1

32

94.1

5.1

1

128

88.6

9.8