Volume 16, Number 1—January 2010
Dispatch
Broiler Chickens as Source of Human Fluoroquinolone-Resistant Escherichia coli, Iceland
Thorunn R. Thorsteinsdottir
, Gunnsteinn Haraldsson, Vala Fridriksdottir, Karl G. Kristinsson, and Eggert Gunnarsson
, Gunnsteinn Haraldsson, Vala Fridriksdottir, Karl G. Kristinsson, and Eggert GunnarssonTable
Antimicrobial drug resistance among Escherichia coli isolates collected from broiler ceca and feed during 2008 compared with isolates collected from ceca and meat during 2005–2007 (1), Iceland*
| Antimicrobial drug | Resistant strains, no. (%) |
||||
|---|---|---|---|---|---|
| 2005–2007 |
2008 |
||||
| Ceca, n = 110 | Meat, n = 75 | Ceca, n = 40 | Feed, n = 22 | ||
| Ampicillin | 20 (18.2) | 12 (16.0) | 0 | 0 | |
| Cefotaxime | 0 | 0 | 0 | 0 | |
| Ceftiofur | 0 | 0 | 0 | 0 | |
| Chloramphenicol | 0 | 0 | 0 | 0 | |
| Ciprofloxacin | 20 (18.2) | 27 (36.0) | 17 (42.5) | 7 (31.8) | |
| Enrofloxacin | 16 (14.5) | 25 (33.3) | NT | NT | |
| Florfenicol | 1 (0.9) | 0 | 0 | 0 | |
| Gentamicin | 2 (1.8) | 1 (1.3) | 0 | 0 | |
| Nalidixic acid | 20 (18.2) | 27 (36.0) | 17 (42.5) | 7 (31.8) | |
| Kanamycin | 1 (0.9) | 0 | 0 | 0 | |
| Streptomycin | 9 (8.2) | 7 (9.3) | 2 (5.0) | 0 | |
| Sulfamethoxazole | 21 (19.1) | 11 (14.7) | 2 (5.0) | 0 | |
| Tetracycline | 15 (13.6) | 8 (10.7) | 1 (2.5) | 0 | |
| Trimethoprim | 16 (14.5) | 10 (13.3) | 1 (2.5) | 0 | |
*NT, not tested. Resistance breakpoints (mg/mL): ampicillin, >16; cefotaxime, >0.5; ceftiofur, >2; chloramphenicol, >32; ciprofloxacin, >0.12; enrofloxacin, >0.5; florfenicol, >32; gentamicin, >8; nalidixic acid, >32; kanamycin, >16; streptomycin, >64; sulfamethoxazole, >512; tetracycline, >16; trimethoprim, >4.
