1. Key Laboratory of Livestock Infectious Diseases in Northeast China, Ministry of Education, College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, No. 120 Dongling Road, Shenhe District, Shenyang, Liaoning 110866, China
2. Department of Cell Engineering, Beijing Institute of Biotechnology, Beijing 100850, China
3. School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
4. Key Laboratory of Zoonose Prevention and Control at Universities of Inner Mongolia Autonomous Region, Medical College, Inner Mongolia Minzu University, Tongliao 028000, China