1. Department of Microbiology and Immunology Faculty of Tropical Medicine Mahidol University Bangkok Thailand
2. Department of Tropical Medicine Medical Microbiology and Pharmacology University of Hawaii at Manoa Honolulu Hawaii USA
3. Department of Veterinary Science Faculty of Agriculture University of Miyazaki Musashimurayama Japan
4. Center for Animal Disease Control University of Miyazaki Musashimurayama Japan
5. Mahidol Osaka Center for Infectious Diseases Osaka University Musashimurayama Japan