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Infection and Immunity, April 2004, p. 2240-2247, Vol. 72, No. 4
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.4.2240-2247.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Probiotic Bifidobacteria Protect Mice from Lethal Infection with Shiga Toxin-Producing Escherichia coli O157:H7

Takashi Asahara,1 Kensuke Shimizu,1 Koji Nomoto,1* Takashi Hamabata,2 Ayako Ozawa,2 and Yoshifumi Takeda3

Yakult Central Institute for Microbiological Research, Kunitachi, Tokyo 186-8650,1 Research Institute, International Medical Center of Japan, Shinjuku, Tokyo 162-8655,2 Faculty of Human Life Sciences, Jissen Women's University, Hino, Tokyo 191-8510, Japan3

Received 11 August 2003/ Returned for modification 14 October 2003/ Accepted 17 December 2003

The anti-infectious activity of probiotic Bifidobacteria against Shiga toxin-producing Escherichia coli (STEC) O157:H7 was examined in a fatal mouse STEC infection model. Stable colonization of the murine intestines was achieved by the oral administration of Bifidobacterium breve strain Yakult (naturally resistant to streptomycin sulfate) as long as the mice were treated with streptomycin in their drinking water (5 mg/ml). The pathogenicity of STEC infection, characterized by marked body weight loss and subsequent death, observed in the infected controls was dramatically inhibited in the B. breve-colonized group. Moreover, Stx production by STEC cells in the intestine was almost completely inhibited in the B. breve-colonized group. A comparison of anti-STEC activity among several Bifidobacterium strains with natural resistance to streptomycin revealed that strains such as Bifidobacterium bifidum ATCC 15696 and Bifidobacterium catenulatum ATCC 27539T did not confer an anti-infectious activity, despite achieving high population levels similar to those of effective strains, such as B. breve strain Yakult and Bifidobacterium pseudocatenulatum DSM 20439. The effective strains produced a high concentration of acetic acid (56 mM) and lowered the pH of the intestine (to pH 6.75) compared to the infected control group (acetic acid concentration, 28 mM; pH, 7.15); these effects were thought to be related to the anti-infectious activity of these strains because the combination of a high concentration of acetic acid and a low pH was found to inhibit Stx production during STEC growth in vitro.

* Corresponding author. Mailing address: Yakult Central Institute for Microbiological Research, 1796 Yaho, Kunitachi, Tokyo 186-8650, Japan. Phone: 81-425-77-8962. Fax: 81-425-77-3020. E-mail: koji-nomoto{at}yakult.co.jp.

Editor: A. D. O'Brien

Infection and Immunity, April 2004, p. 2240-2247, Vol. 72, No. 4
0019-9567/04/$08.00+0     DOI: 10.1128/IAI.72.4.2240-2247.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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