1. Department of Microbiology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China.
2. Biosafety Level-3 Laboratory, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou, China.
3. Guangzhou Center for Disease Control and Prevention, Guangzhou, China.
4. Department of Biomedical Sciences, City University of Hong Kong, Hong Kong SAR, China.
5. Department of Biochemistry, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Hong Kong SAR, China.