1. Animal Health Laboratory, Graduate School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan
2. Department of Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo, Japan
3. National Institute of Animal Health, National Agriculture and Food Research Organization, Sapporo, Hokkaido, Japan
4. Department of Veterinary Pathology, Graduate School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan
5. Department of Large Animal Sciences, Graduate School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan
6. Department of Veterinary Biochemistry, Graduate School of Veterinary Medicine, Rakuno Gakuen University, Ebetsu, Hokkaido, Japan
7. Farm Animal Veterinary Nursing Laboratory, Department of Veterinary Associated Science, Faculty of Veterinary Medicine, Okayama University Of Science, Imabari, Aichi, Japan