1. Department of Veterinary Science, National Institute of Infectious Diseases (NIID), Tokyo 162-8640, Japan
2. Faculty of Veterinary Technology, Kasetsart University, Bangkok 10900, Thailand
3. Office of Veterinary Public Health, Department of Health, Bangkok 10400, Thailand
4. Faculty of Veterinary Medicine, Rajamangala University of Technology Tawan-ok, Chonburi 20110, Thailand
5. Joint Graduate School of Veterinary Medicine, Yamaguchi University, Yamaguchi 753-8515, Japan