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SHIN-ICHIRO KAWAZU
National Institute of Animal Health, Tsukuba, Ibaraki 305, Japan
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CHANDRAWATHANI PANCHADCHARAM
Veterinary Research Institute, Ipoh 31400, Perak, W. Malaysia
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TAKESHI KAWAZU
The Chemo-Sero-Therapeutic Research Institute, Shimizu, Kumamoto 860, Japan
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TSUTOMU SEKIZAKI
National Institute of Animal Health, Tsukuba, Ibaraki 305, Japan
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KOZO FUJISAKI
National Institute of Animal Health, Tsukuba, Ibaraki 305, Japan