1. Department of Microbiology, School of Medicine, Jiangsu University, 310 Xuefu Road, Zhenjiang, Jiangsu, China
2. Department of Swine Infectious Disease, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, 518 Ziyue Road, Shanghai, China
3. The Affiliated Hospital of Jiangsu University, 438 Jiefang Road, Zhenjiang, Jiangsu, China
4. Vitalant Research Institute, 270 masonic avenue, San Francisco, CA, USA
5. Department of Laboratory Medicine, University of California, 270 masonic avenue, San Francisco, San Francisco CA, USA