Table 1 List of antimicrobial discs used in the study, their strength and zone diameter interpretive cut off points in mm
Disk | Disc strength in μg | Resistant | Intermediate | Susceptible |
|---|---|---|---|---|
≤ (mm) | (mm) | ≥ (mm) | ||
Amikacin | 30 | 14 | 15–16 | 17 |
Amoxicillin + clavulanic acid | 20/10 | 13 | 14–17 | 18 |
Ampicillin | 10 | 13 | 14–16 | 17 |
Cefoxitin | 30 | 14 | 15–17 | 18 |
Ceftriaxone | 30 | 19 | 20–22 | 23 |
Cephalothin | 30 | 14 | 15–17 | 18 |
Chloramphenicol | 30 | 12 | 13–17 | 18 |
Ciprofloxacin | 5 | 20 | 21–30 | 31 |
Doxycycline | 30 | 10 | 11–13 | 14 |
Gentamicin | 10 | 12 | 13–14 | 15 |
Kanamycin | 30 | 13 | 14–17 | 18 |
Nalidixic acid | 30 | 13 | 14–18 | 19 |
Neomycin | 30 | 12 | 13–16 | 17 |
Oxytetracycline | 30 | 11 | 12–14 | 15 |
Streptomycin | 10 | 11 | 12–14 | 15 |
Sulfamethoxazole and Trimethoprim | 23.75 and 1.25 | 10 | 11–15 | 16 |