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Piyarat Subhachalat
Animal Health Laboratory, School of Agriculture, Ibaraki University, 3-21-1 Ami, Ibaraki 300-0393, and The United Graduate School, Tokyo University of Agriculture and Technology, 3-5-8 Fuchu-shi, Tokyo 183-8538, Japan
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Shoji Shirasaka
Animal Health Laboratory, School of Agriculture, Ibaraki University, 3-21-1 Ami, Ibaraki 300-0393, Japan
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Hiromi Nakajima
Ibaraki Prefecture Western Food Hygiene Inspection Center, 446-2 Higashikyodaotsu, Shimodate, 308-0827, Japan
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Yosikazu Adachi
Animal Health Laboratory, School of Agriculture, Ibaraki University, 3-21-1 Ami, Ibaraki 300-0393, and The United Graduate School, Tokyo University of Agriculture and Technology, 3-5-8 Fuchu-shi, Tokyo 183-8538, Japan