Institution: | 1. Division of Virology, National Institute for Biological Standards and Control, Blanche Lane, South Mimms, Potters Bar, Hertfordshire EN6 3QG, UK;2. Institute of Biological Products, Department of Medical Sciences, Ministry of Public Health, Nonthaburi 11000, Thailand;3. National Institute of Health, Department of Medical Sciences, Ministry of Health, Nonthaburi 11000, Thailand |