Table 2 Zone of interpretation chart for antimicrobials (inhibition zone diameter in mm) in antimicrobial susceptibility test

Ampicillin (AMP)

10 µg

≤ 13

14–16

≥ 17

Chloramphenicol (c)

30 µg

≤ 12

13–17

≥ 18

Clindamycin (DA)

2 µg

≤ 15

16–18

≥ 19

Erythromycin (E)

15 µg

≤ 13

14–22

≥ 23

Gentamicin (CN)

10 µg

≤ 12

13–14

≥ 15

Kanamycin (K)

30 µg

≤ 13

14–17

≥ 18

Oxytetracycline (OXY)

30 µg

≤ 14

15–18

≥ 19

Penicillin (P)

10 U

≤ 14

—

≥ 15

Streptomycin (S)

10 µg

≤ 11

12–14

≥ 15

Tetracycline (TE)

30 µg

≤ 14

15–18

≥ 19

Trimethoprim-sulfamethoxazole (SXT)

23 µg

≤ 10

11–15

≥ 16

Vancomycin (VA)

30 µg

≤ 14

15–16

≥ 17