Institution: | 1. Animal Health Biotechnology, Temasek Life Sciences Laboratory, National University of Singapore, Singapore, Singapore.; 2. Department of Pathology, Singapore General Hospital, Singapore, Singapore.; 3. Influenza Division, Centers for Disease Control and Prevention, Atlanta, Georgia, United States of America.; 4. Department of Microbiology, Faculty of Medicine, National University of Singapore, Singapore, Singapore.;University of Nebraska, United States of America |