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Wen Zhong ZHUANG
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Masakazu HATTORI
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Misao ONUMA
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Hiroshi KODAMA
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Author's Organization:Department of Epizootiology, Faculty of Veterinary Medicine, Hokkaido University Department of Epizootiology, Faculty of Veterinary Medicine, Hokkaido University Department of Epizootiology, Faculty of Veterinary Medicine, Hokkaido University Laboratory of Veterinary Immnunology, Department of Veterinary Science, College of Agriculture, University of Osaka Prefecture