Abstract
1 Laboratory of Persistent Viral Diseases, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, MT 59840, USA
2 Institute for Antiviral Research, Animal, Dairy, and Veterinary Sciences Department and Biotechnology Center, Utah State University, Logan, UT 84322-4700, USA
3 Chengdu Jinniu Institute, Food Bureau of Sichuan Province, Chengdu Sichuan, China