1. Research Institute of Green Science and Technology, Shizuoka University, 836 Ohya Suruga-ku, Shizuoka 422-8529, Japan
2. Department of Bioscience, Graduate School of Science and Technology, Shizuoka University, 836 Ohya Suruga-ku, Shizuoka 422-8529, Japan
3. Department of Virology 2, National Institute of Infectious Diseases, 4-7-1 Gakuen, Musashimurayam-shi, Tokyo 208-0011, Japan