Table 1 Zone diameter interpretive criteria (mm) by disk diffusion method for E. coli

Amoxicillin/clavulanic acid (20/10 µg)

AMC

≥ 18

14–17

≤ 13

[9]

Cefazolin (30 µg)

CZ

≥ 23

20–22

≤ 19

[9]

Ceftriaxone (30 µg)

CRO

≥ 23

20–22

≤ 19

[9]

Amikacin (30 µg)

AK

≥ 17

15–16

≤ 14

[9]

Streptomycin (10 µg)

S

≥ 15

12–14

≤ 11

[9]

Gentamicin (10 µg)

GN

≥ 16

13–15

≤ 12

[10]

Trimethoprim-sulphamethoxazole (1.25/23.7 µg)

SXT

≥ 16

11–15

≤ 10

[9]