1. Paediatric Unit, Bamrasnaradura Infectious Diseases Institute, Ministry of Public Health (MOPH), Nonthaburi, Thailand
2. Thai National Influenza Center, National Institute of Health, MOPH, Nonthaburi, Thailand
3. Nursing Section, Bamrasnaradura Infectious Diseases Institute, Ministry of Public Health (MOPH), Nonthaburi, Thailand
4. Laboratory Section, Bamrasnaradura Infectious Diseases Institute, Ministry of Public Health (MOPH), Nonthaburi, Thailand