1. Department of Microbiology and Immunology, College of Veterinary Medicine, South China Agricultural University, Guangzhou, China
2. Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, China
3. Department of Veterinary Medicine, College of Animal Science, Guizhou University, Guiyang, China
4. Department of Viral Biologics, China Institute of Veterinary Drug Control, Beijing, China