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Eiji YOKOYAMA
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Yasuji KATSUBE
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Soichi MARUYAMA
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Kazumichi TAMURA
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Author's Organization:Laboratory of Veterinary Public Health, Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, Nihon University Laboratory of Veterinary Public Health, Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, Nihon University Laboratory of Veterinary Public Health, Department of Veterinary Medicine, College of Agriculture and Veterinary Medicine, Nihon University Department of Bacteriology, National Institute of Health