1. Department of Virology, Institute of Tropical Medicine, Nagasaki University, Sakamoto-machi 1-12-4, Nagasaki City 852-8523, Japan
2. Central Laboratory, Institute of Tropical Medicine, Nagasaki University, Nagasaki University, Sakamoto-machi 1-12-4, Nagasaki City 852-8523, Japan
3. Department of Vector Ecology and Environment, Institute of Tropical Medicine, Nagasaki University, Sakamoto-machi 1-12-4, Nagasaki City 852-8523, Japan
4. Research and Biotechnology, St. Luke’s Medical Center, 279 E. Rodriguez Sr. Blvd, Quezon City 1102, Philippines