Affiliation: | Departments of Obstetrics and Gynaecology, Infectious Disease Control Division, Ministry of Public Health, Bangkok, Thailand;Departments of Paediatrics, Infectious Disease Control Division, Ministry of Public Health, Bangkok, Thailand;Departments of Medicine, Infectious Disease Control Division, Ministry of Public Health, Bangkok, Thailand;Faculty of Medicine, Ramathibodi Hospital, Infectious Disease Control Division, Ministry of Public Health, Bangkok, Thailand |