Research Article
Multiple Antimicrobial Resistance of Escherichia coli Isolated from Chickens in Iran
Table 1
Antimicrobial resistance and susceptibility of E. coli isolated from chickens (S) intermediate (I) resistant (R).
| | Antimicrobial agent | Diffusion zone breakpoint (mm) | Bacterial isolates () | | R | I | S | | % | | % | | % |
| | Aminoglycosides | | | | | | | | | Gentamicin (GM/10 g) | ≤12 | 18 | (5.66) | 39 | (12.11) | 261 | (82.23) | | Phenicols | | | | | | | | | Chloramphenicol (C/30 g) | ≤12 | 66 | (20.75) | 69 | (21.65) | 183 | (57.60) | | Florfenicol (FFc/30 g) | ≤13 | 114 | (35.85) | 131 | (41.31) | 73 | (22.84) | | Quinolones | | | | | | | | | Ciprofloxacin (CP/5 g) | ≤15 | 24 | (7.55) | 45 | (14.11) | 249 | (78.34) | | Enrofloxacin (NFX/5 g) | ≤17 | 120 | (37.74) | 71 | (22.44) | 130 | (40.82) | | Danofloxacin (D/30 g) | ≤16 | 90 | (28.30) | 36 | (11.37) | 192 | (60.33) | | Difloxacin (DIF/25 g) | ≤17 | 102 | (32.08) | 26 | (8.33) | 189 | (59.59) | | Tetracyclines | | | | | | | | | Oxytetracycline (T/30 g) | ≤14 | 138 | (43.40) | 123 | (38.64) | 57 | (17.96) | | Doxycycline (D/30 g) | ≤13 | 54 | (16.98) | 135 | (42.30) | 129 | (40.72) | | Chlortetracycline (CTe/30 g) | ≤14 | 108 | (33.96) | 92 | (28.92) | 118 | (37.12) | | Macrolides | | | | | | | | | Erythromycin (E/15 g) | ≤14 | 228 | (71.70) | 67 | (21.04) | 23 | (7.26) | | Tylosin (TYC/30 g) | ≤14 | 282 | (88.68) | 36 | (11.32) | 0 | (0.0) | | Sulfadimethoxine-Trimethoprim (SXT/25 g) | ≤10 | 126 | (39.62) | 75 | (23.48) | 117 | (36.90) |
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