Table 1 Disc strength, zones of inhibition, WHO and OIE rank of each antimicrobial tested.
From: Antimicrobial resistance in commensal faecal Escherichia coli of hospitalised horses
Antimicrobial Disc | Disc Strength | Zones of inhibition (mm) | WHO rank 2007 | OIE rank 2007 (including horses) | ||
|---|---|---|---|---|---|---|
Resistant | Intermediate | Susceptible | ||||
Gentamicin | 10 mcg | ≤ 12 | 13-14 | ≥ 15 | Critical | Critical |
Amoxicillin Clavulanate | 20/10 mcg | ≤ 13 | 14-17 | ≥18 | Critical | Critical |
Ampicillin | 10 mcg | ≤ 13 | 14-16 | ≥17 | Critical | Critical |
Cefpodoxime | 10 mcg | ≤ 17 | 18-20 | ≥21 | Critical | |
Ceftiofur | 30 mcg | ≤ 19 | 20-23 | ≥24 | Critical | |
Cefquinome | 30 mcg | ≤ 19 | 20-22 | ≥23 | Critical | |
Chloramphenicol | 30 mcg | ≤ 12 | 13-17 | ≥18 | Florphenicol listed as critical Chloramphenicol used as indicator | |
Ciprofloxacin | 5 mcg | ≤ 15 | 16-20 | ≥21 | Critical | |
Marbofloxacin | 5 mcg | ≤ 14 | 15-18 | ≥19 | Critical | |
Colistin | 25 mcg | ≤ 14 | ≥15 | Critical | ||
Trimethoprim sulphamethoxazole | (1.25/23.75) 25 mcg | ≤ 10 | 11-15 | ≥16 | Highly important | Critical |
Tetracycline | 30 mcg | ≤ 14 | 15-18 | ≥19 | Highly important | Critical |