1. Department of Microbiology, The University of Hong Kong, Hong Kong SAR, PR China
2. Carol Yu Centre for Infection, The University of Hong Kong, Hong Kong SAR, PR China
3. State Key Laboratory of Emerging Infectious Diseases, The University of Hong Kong, Hong Kong SAR, PR China
4. Research Centre of Infection and Immunology, The University of Hong Kong, Hong Kong SAR, PR China
5. Guangzhou Center for Disease Control and Prevention, Guangzhou, PR China