1Department of Virology, Institute of Tropical Medicine, Nagasaki University, 1-12-4 Sakamoto, , Nagasaki, 852-8523, Japan. myamyat@tm.nagasaki-u.ac.jp.
2Department of Virology, Institute of Tropical Medicine, Nagasaki University, 1-12-4 Sakamoto, , Nagasaki, 852-8523, Japan.
3Section of Pharmacognosy, Institute of Natural Medicine, University of Toyama, 2630 Sugitani, Toyama, 930-0194, Japan.
4Department of Immune Regulation, Shionogi Global Infectious Diseases Division, Institute of Tropical Medicine, Nagasaki University, Nagasaki, 852-8523, Japan.
5Department of Virology, Institute of Tropical Medicine, Nagasaki University, 1-12-4 Sakamoto, , Nagasaki, 852-8523, Japan. moritak@nagasaki-u.ac.jp.