Antibiotic class | Specific antibiotic tested | Concentration | Interpretive categories and zone diameter breakpoints (nearest whole mm)a | No. of isolates/Total isolates | ||||
---|---|---|---|---|---|---|---|---|
Rb | I | S | R | I | S | |||
Macrolides | Azithromycin | 15 μg | ≤ 12 | – | ≥ 13 | 22/34 | – | 12/34 |
Cephalosporins | Ceftriaxone | 30 μg | ≤ 19 | 20–22 | ≥ 23 | 9/34 | 0/34 | 25/34 |
Cephalexin | 30 μg | ≤ 14 | – | ≥ 15 | 33/34 | – | 1/34 | |
Penicillins | Penicillin | 10 IU | ≤ 14 | – | ≥ 15 | 33/34 | – | 1/34 |
Amoxicillin | 25 μg | ≤ 13 | 14–16 | ≥ 17 | 30/34 | 0/34 | 4/34 | |
Aminoglycosides | Gentamicin | 10 μg | ≤ 12 | 13–14 | ≥ 15 | 2/34 | 0/34 | 32/34 |
Tetracyclines | Tetracycline | 30 μg | ≤ 11 | 12–14 | ≥ 15 | 26/34 | 1/34 | 7/34 |
Phenicols | Chloramphenicol | 30 μg | ≤ 12 | 13–17 | ≥ 18 | 13/34 | 5/34 | 16/34 |