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Table 1 List of antimicrobial discs used in the study, their strength and zone diameter interpretive cut off points in mm

From: Salmonella serotypes and their antimicrobial susceptibility in apparently healthy dogs in Addis Ababa, Ethiopia

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