Abstract
1 2-7-33, Higashi-tokura, Kokubunnji, Tokyo 185-0002, Japan
2 Laboratory of Animal Health, Department of Animal Science, Tokyo University of Agriculture, 1737 Funako, Atsugi, Kanagawa 243-0034, Japan
3 Chuoh Animal Health and Hygiene Service Center of Chiba Prefecture, 497 Iwatomi, Sakura, Chiba 243-0034, Japan
4 Internal Medicine, National Defense Medical College, Saitama 359-8513, Japan
5 Safety Research Team, National Institute of Animal Health, 3-1-5 Kannondai, Tsukuba, Ibaraki 305-0856, Japan
6 Yakult Central Institute for Microbiological Research, 1796 Yaho, Kunitachi, Tokyo 186-8650, Japan