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SHIGEO HONJO
Department of Veterinary Science, National Institute of Health
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MASAO TAKASAKA
Department of Veterinary Science, National Institute of Health
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KIYOSHI IMAIZUMI
Department of Veterinary Science, National Institute of Health
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HIDEMAS OGAWA
Department of Pathology, National Institute of Health
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RINTARO NAKAYA
Department of Bacteriology I, National Institute of Health