1. National Institute of Health, Department of Medical Science, Ministry of Public Health, Nonthaburi, Thailand.
2. Bureau of Epidemiology, Department of Disease Control, Ministry of Public Health, Nonthaburi, Thailand.
3. Department of Medical Laboratory Science and Biotechnology, Kaohsiung Medical University, Kaohsiung, Taiwan.
4. Research Institute of Microbial Diseases, Osaka University, Osaka, Japan.
5. Thailand-Japan Research Collaboration Center on Emerging and Re-emerging Infections (RCC-ERI), Nonthaburi, Thailand.