Research Article
Antibiotic Resistance Profile of Bacteria Isolated from Wastewater Systems in Eastern Ethiopia
Table 2
Disk content and EUCAST breaking points of each antibiotic tested for specific indicator bacteria.
| Antibiotic class | Antibiotic | Code | Content (µg) | E. coli | Enterococci spp. | P. aeruginosa | Aeromonas spp. | <R | ≥S | <R | ≥S | <R | ≥S | R | S |
| β-lactams | Ampicillin | AMP | 10|2 | 14 | 14 | 8 | 10 | IR | NR | Amoxicillin/Clav | AMC30 | 20/10 | 19 | 19 | | | IR | NR | Cephalosporin | Ceftazidime | CAZ30 | 10 | 19 | 22 | IR | 17 | 17 | 21 | 24 | Cefepime | CFP | 30 | 24 | 27 | IR | 21 | 21 | 24 | 27 | Aminoglycosides | Gentamicin | GEN10 | 10|30 | 14 | 17 | 8 | 8 | 15 | 15 | NR | Amikacin | AMIK | 30 | 15 | 18 | | | 15 | 18 | NR | Fluoroquinolone | Levofloxacin | LVL5 | 5 | 23 | 19 | 15 | 15 | 22 | 22 | 24 | 27 | Ciprofloxacin | CIP5 | 5 | 24 | 26 | 15 | 15 | 26 | 26 | 24 | 27 | Carbapenem | Meropenem | MRP10 | 10 | 16 | 22 | NR | 18 | 24 | | | Sulfonamides | Co-Trimoxazole | SxT25 | 1.25/23.75 | 11 | 14 | 23 | 23 | NR | 16 | 19 |
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IR: intrinsically resistant, NR: not recommended. We have used two types of ampicillin and gentamicin disk for AST of E. coli and Enterococci spp. |