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T. KUME
National Institute of Animal Health
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S. HOMMA
National Institute of Animal Health
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Y. NODA
National Institute of Animal Health
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M. INOUE
Central Livestock Hygiene Service Center, Chiba Pref.
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M. YAMADA
Central Livestock Hygiene Service Center, Chiba Pref.
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S. KANEKO
Chiba Animal Health Laboratory
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T. YAMAZAKI
Mutual Aid Association of Agriculture