1. Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa 252-0880, Japan
2. Department of Veterinary Medicine, Iwate University, 3-18-8 Ueda, Morioka, Iwate 020-8550, Japan
3. Faculty of Nutrition, Koushien University, 10-1 Momijigaoka, Takarazuka, Hyogo 665-0006, Japan
4. School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5201, Japan
5. Division of Biomedical Food Research, National Institute of Health Sciences, 3-25-26 Tonomachi, Kawasaki-ku, Kawasaki, Kanagawa 210-9501, Japan
6. Department of Parasitology, National Institute of Infectious Diseases, 1-23-1 Toyama, Shinjuku-ku, Tokyo 162-8640, Japan
7. Department of Animal Hygiene, Kitasato University, 23-35-1 Higashi, Towada, Aomori 034-8628, Japan