1. Department of Medical Research (Pyin Oo Lwin Branch), Ministry of Health and Sports, Pyin Oo Lwin, Mandalay Region, Myanmar;
2. Department of Virology, Institute of Tropical Medicine, Nagasaki University, Nagasaki, Japan;
3. Research and Biotechnology, St. Luke’s Medical Center, Quezon City, Philippines;
4. Department of Virology I, National Institute of Infectious Diseases, Tokyo, Japan