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Kotaro TUCHIYA
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Tatsuhiko KASAOKA
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Masayuki AZETAKA
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Eiji TAKAHASHI
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Shin-ichiro KONISHI
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Author's Organization:Department of Veterinary Microbiology, Faculty of Agriculture, University of Tokyo Department of Veterinary Microbiology, Faculty of Agriculture, University of Tokyo Department of Veterinary Microbiology, Faculty of Agriculture, University of Tokyo Department of Veterinary Microbiology, Faculty of Agriculture, University of Tokyo Department of Veterinary Microbiology, Faculty of Agriculture, University of Tokyo