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JAC Advance Access published online on January 6, 2003
Journal of Antimicrobial Chemotherapy, doi:10.1093/jac/dkg014
© 2003 by The British Society for Antimicrobial Chemotherapy
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© 2003 The British Society for Antimicrobial Chemotherapy

Brief report

A national surveillance of antimicrobial resistance in Escherichia coli isolated from food-producing animals in Japan

Mayumi Kijima-Tanaka 1*, Kanako Ishihara 1, Ayako Morioka 1, Akemi Kojima 1, Tomoko Ohzono 1, Kaori Ogikubo 1, Toshio Takahashi 1, Yutaka Tamura 1

1 National Veterinary Assay Laboratory, Ministry of Agriculture, Forestry and Fisheries, 1-15-1 Tokura, Kokubunji, Tokyo 185-8511, Japan

* Corresponding author. E-mail: mayumik{at}nval.go.jp.

Received 30 May 2002 ; revised 2 August 2002 ; accepted 25 September 2002

Abstract

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
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