1. Department of Clinical Veterinary Medicine, and Key Laboratory for Zoonosis Research, Ministry of Education, College of Veterinary Medicine, Jilin University, Changchun, China
2. Section of Infectious Diseases, Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
3. Department of Immunobiology, Yale University School of Medicine, New Haven, Connecticut, USA
4. Department of Comparative Medicine, Yale University School of Medicine, New Haven, Connecticut, USA
5. Department of Veterinary Medicine, University of Maryland, College Park, Maryland, USA
6. Howard Hughes Medical Institute, Chevy Chase, Maryland, USA