Table 1 Antimicrobial susceptibility profiles of 267 aEPEC strains isolated from different sources

Penicillins

 Ampicillin

84 (55.6)

15 (46.9)

20 (39.2)

13 (39.4)

132 (49.4)

0.1185

 Piperacillin

71 (47.0)

13 (40.6)

19 (37.3)

7 (21.2)

110 (41.2)

0.0484

β-Lactam/β-lactamase inhibitor combinations

 Amoxicillin–clavulanic acid

14 (9.3)

0

10 (19.6)

3 (9.1)

27 (10.1)

0.0319

 Ampicillin–sulbactam

24 (15.9)

0

11 (21.6)

9 (27.3)

44 (16.5)

0.0177

Cephems

 Cefepime

14 (9.3)

3 (9.4)

0

0

17 (6.4)

0.0396

 Cefotaxime

39 (25.8)

5 (15.6)

1 (2.0)

4 (12.1)

49 (18.4)

0.0013

 Ceftriaxone

38 (25.2)

5 (15.6)

2 (3.9)

3 (9.1)

48 (18.0)

0.0029

 Ceftazidime

7 (4.6)

1 (3.1)

0

0

8 (3.0)

0.2622

 Cefuroxime

39 (25.8)

5 (15.6)

2 (3.9)

6 (18.2)

52 (19.5)

0.0071

Monobactams

 Aztreonam

20 (12.6)

3 (9.4)

0

1 (3.0)

23 (8.6)

0.0202

Carbapenems

 Imipenem

0

0

0

0

0

–

 Meropenem

0

0

0

0

0

–

Aminoglycosides

 Gentamicin

57 (37.7)

3 (9.4)

11 (21.6)

6 (18.2)

77 (28.8)

0.0019

 Kanamycin

22 (14.6)

1 (3.1)

9 (17.6)

7 (21.2)

39 (14.6)

0.1782

 Streptomycin

78 (51.7)

9 (28.1)

20 (39.2)

16 (48.5)

123 (46.1)

0.0692

Tetracyclines

 Tetracycline

89 (58.9)

15 (46.9)

21 (41.2)

21 (63.6)

146 (54.7)

0.0816

Quinolones

 Nalidixic acid

62 (41.1)

7 (21.9)

17 (33.3)

8 (24.2)

94 (35.2)

0.0866

Fluoroquinolones

 Ciprofloxacin

8 (5.3)

0

4 (7.8)

1 (3.0)

13 (4.9)

0.4053

 Norfloxacin

5 (3.3)

0

4 (7.8)

0

9 (3.4)

0.1447

 Levofloxacin

8 (5.3)

0

4 (7.8)

0

12 (4.5)

0.2020

Folate pathway inhibitors

 Trimethoprim–sulfamethoxazole

72 (47.7)

6 (18.8)

18 (35.3)

9 (27.3)

105 (39.3)

0.0060

Phenicols

 Chloramphenicol

11 (7.3)

0

9 (17.6)

8 (24.2)

28 (10.5)

0.0020

Nitrofurans

 Nitrofurantoin

3 (2.0)

0

1 (2.0)

0

4 (1.5)

0.7275