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Kunio SHIMOZAWA
Racehorse Hospital, Ritto Training Center, Japan Racing Association, 1028 Misono, Ritto-cho, Kurita-gun, Siga 520-30, Japan
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Toru ANZAI
Epizootic Research Station, Equine Research Institute, Japan Racing Association, 1400-4 Shiba, Kokubunji-machi, Shimotsuga-gun, Tochigi 329-04, Japan
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Masanobu KAMADA
Equine Department, Japan Racing Association, 4-3-1 Toranomon, Minato-ku, Tokyo 105, Japan
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Kosuke TAKATORI
Division of Microbiology, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya-ku, Tokyo 158, Japan