1. Department of Veterinary Sciences, Faculty of Agriculture, University of Miyazaki, 1-1 Gakuen-Kibanadai-Nishi, Miyazaki 889-2192, Japan
2. Department of Animal Medicine, Faculty of Veterinary Medicine, Benha University, 13736 Moshtohor, Toukh, Qalyubia, Egypt
3. Division of Immunology, Department of Infectious Diseases, Faculty of Medicine, University of Miyazaki, 5200 Kihara, Kiyotake, Miyazaki 889-1692, Japan
4. Division of Prevention and Control for Animal Diseases, Center for Animal Disease Control, University of Miyazaki, 1-1 Gakuen-Kibanadai-Nishi, Miyazaki 889-2192, Japan