1. Department of Microbiology; Fujita Health University School of Medicine; 1-98 Dengakugakubo, Kutsukake-cho Toyoake Aichi 470-1192
2. Laboratory of Veterinary Epidemiology; Graduate School of Life and Environmental Sciences; Osaka Prefecture University; 1-58 Rinku Ourai Kita Izumisano Osaka 598-8531 Japan