1. Department of Microbiology, the University of Hong Kong, Hong Kong 999077, China
2. Department of Clinical Laboratory, Second People’s Hospital of Wuhu, Wuhu 241000, Anhui Province, China
3. Key Laboratory of Medical Molecular Virology of Ministries of Education and Health, Shanghai Medical College and Institute of Medical Microbiology, Fudan University, Shanghai 200032, China
4. Lindsley F. Kimball Research Institute, New York Blood Center, New York, NY 10065, USA