1. Department of Microbiology; The Chinese University of Hong Kong; Hong Kong Special Administrative Region China
2. Hong Kong Observatory; Government of The Hong Kong Special Administrative Region China
3. Department of Paediatrics, Faculty of Medicine; The Chinese University of Hong Kong; Hong Kong Special Administrative Region China
4. Division of Epidemiology, The Jockey Club School of Public Health and Primary Care, Faculty of Medicine; The Chinese University of Hong Kong; Hong Kong Special Administrative Region China
5. Stanley Ho Centre for Emerging Infectious Diseases, The Jockey Club School of Public Health and Primary Care, Faculty of Medicine; The Chinese University of Hong Kong; Hong Kong Special Administrative Region China