Author's Organization:Department of Veterinary Public Health, Faculty of Agriculture, Tottori University Department of Veterinary Public Health, Faculty of Agriculture, Tottori University Department of Veterinary Public Health, Faculty of Agriculture, Tottori University Department of Veterinary Public Health, Faculty of Agriculture, Tottori University Department of Veterinary Public Health, Faculty of Agriculture, Tottori University Department of Veterinary Public Health, Faculty of Agriculture, Tottori University Department of Bacteriology, Tottori University School of Medicine