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Applied and Environmental Microbiology, December 2000, p. 5540-5543, Vol. 66, No. 12
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Loss of O157 O Antigenicity of Verotoxin-Producing Escherichia coli O157:H7 Surviving under Starvation Conditions

Yukiko Hara-Kudo,1,* Michiko Miyahara,2 and Susumu Kumagai1

Department of Biomedical Food Research, National Institute of Infectious Diseases, Shinjuku-ku, Tokyo 162-8640,1 and Division of Microbiology, National Institute of Health Sciences, Setagaya-ku, Tokyo 158-8501, Japan2

Received 27 March 2000/Accepted 29 September 2000

Verotoxin (VT)-producing Escherichia coli O157:H7 was culturable on agar media after being left in water for 21 months. However, there were a number of colonies which had lost O157 O antigenicity. These colonies produced VTs, which are pathogenic to humans. These observations suggest that the immunologic methods based on O157 O antigenicity are unable to detect and isolate VT-producing E. coli in foods and other environments if the organism has been under starvation conditions for a long period.


* Corresponding author. Mailing address: Department of Biomedical Food Research, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan. Phone: 81 3 5285 1111. Fax: 81 3 5285 1176. E-mail: ykudo{at}nih.go.jp.


Applied and Environmental Microbiology, December 2000, p. 5540-5543, Vol. 66, No. 12
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.



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