National Institute of Infectious Diseases, Nagasaki University, Nagasaki University, Nagasaki University, Shimane University, National Institute of Hygiene and Epidemiology, Nanogen Pharmaceutical Biotechnology JSC, National Institute of Hygiene and Epidemiology, Vietnam, Nagasaki University - Department of Emerging Infectious Diseases, Nagasaki University and National Institute of Hygiene and Epidemiology