1. Department of Pathogen Biology, Guangdong Provincial Key Laboratory of Tropical Disease Research, School of Public Health and Tropical Medicine, Southern Medical University, Guangzhou, Guangdong, the People’s Republic of China (e-mail: )
2. Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, the People’s Republic of China (e-mail: )
3. Department of Biomedical Sciences & Pathobiology, VA-MD Regional College of Veterinary Medicine, Virginia Tech, Duck Pond Drive, Blacksburg, Virginia 24061, U.S.A. (e-mail: )