1. Laboratory of Veterinary Internal Medicine; Division of Animal Life Science; Graduate School; Tokyo University of Agriculture and Technology; 3-5-8 Saiwai-cho Fuchu Tokyo 183-8509 Japan
2. Kariya Animal Hospital; 5-20-2 Morishita Koto-ku Tokyo 135-0004 Japan
3. Department of Bacteriology; Graduate school of Biomedical and Health Sciences; Hiroshima University; 1-2-3 Kasumi Minami-ku Hiroshima 734-8551 Japan