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Volume 16, Number 1—January 2010

Dispatch

Broiler Chickens as Source of Human Fluoroquinolone-Resistant Escherichia coli, Iceland

Thorunn R. ThorsteinsdottirComments to Author , Gunnsteinn Haraldsson, Vala Fridriksdottir, Karl G. Kristinsson, and Eggert Gunnarsson
Author affiliations: University of Iceland, Reykjavík, Iceland (T.R. Thorsteinsdottir, G. Harladsson, V. Fridriksdottir, K.G. Kristinsson, E. Gunnarsson); Landspitali University Hospital, Reykjavík (G. Haraldsson, K.G. Kristinsson)

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Table

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.

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