1. Diagnostic Center for Animal Health and Food Safety, Obihiro University of Agriculture and Veterinary Medicine, Obihiro, Hokkaido 080–8555, Japan
2. National Institute of Veterinary Research, 86 Truong Chinh, Dong Da, Hanoi, Vietnam
3. United Graduate School of Agricultural Sciences, Iwate University, Morioka, Iwate 020–8550, Japan
4. Faculty of Veterinary Science, Mahidol University, Nakhon Pathom, Thailand