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Haruo MATSUDA
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Makoto INOUE
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Munetaka NEGORO
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Masayoshi MURATA
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Author's Organization:Department of Microbiology and Hygiene, Faculty of Applied Biological Science, Hiroshima University Department of Veterinary Pathology, Faculty of Agriculture, Yamaguchi University Department of Microbiology and Hygiene, Faculty of Applied Biological Science, Hiroshima University Department of Microbiology and Hygiene, Faculty of Applied Biological Science, Hiroshima University