1. Department of Microbiology & Immunology, University of Texas Medical Branch, Galveston, Texas 77550, USA
2. Department of Pathogen Biology & Immunology, Jiangsu Key Laboratory of Pathogen Biology, Nanjing Medical University, Nanjing, Jiangsu 210019, China
3. Department of Pathogen Biology, School of Medicine, Nantong University, Nantong, Jiangsu 226001, China