JAC Advance Access originally published online on January 6, 2003
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Journal of Antimicrobial Chemotherapy (2003) 51, 447-451
© 2003 The British Society for Antimicrobial Chemotherapy
A national surveillance of antimicrobial resistance in Escherichia coli isolated from food-producing animals in Japan
National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, 1-15-1 Tokura, Kokubunji, Tokyo 185-8511, Japan
Received 30 May 2002; returned 2 August 2002; revised 15 September 2002; accepted 25 September 2002
A nationwide investigation of antimicrobial susceptibility in Escherichia coli isolated from food-producing animals was performed in Japan. MICs of 18 antimicrobial agents were determined for a total of 1018 isolates. Higher resistance rates were observed against sulfadimethoxine, oxytetracycline and dihydrostreptomycin, followed by ampicillin and kanamycin. Resistance was more frequently observed among broiler isolates, followed by isolates from pigs. Almost 10% of broiler isolates were resistant to fluoroquinolones and extremely high MICs (100 mg/L) were observed. In general, antimicrobial resistance rates in E. coli have declined in recent years, with the exception of resistance to fluoroquinolones among broiler isolates, which has increased.
Keywords: Escherichia coli, antimicrobial resistance, cattle, pig, broiler
* Corresponding author. Tel: +81-42-321-1841; Fax: +81-42-321-1769; E-mail: mayumik{at}nval.go.jp
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