1. Laboratory of Veterinary Internal Medicine, Faculty of Agriculture, Tottori University, 101 Minami 4-chome, Koyama, Tottori 680-8533, Japan
2. Laboratory of Food Microbiology and Food Safety, Department of Health and Environmental Sciences, School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido 069-8501, Japan
3. Department of Applied Veterinary Science, the United Graduate School of Veterinary Sciences, Gifu University, 1–1 Yanagido, Gifu 501-1193, Japan