Affiliation: | 1. College of Animal Medicine, Agricultural University of Hebei, Baoding, Hebei, China;2. Hebei Engineering and Technology Research Center of Veterinary Biotechnology, Baoding, Hebei, China;3. North China Research Center of Animal Epidemic Pathogen Biology, Agriculture Ministry, Baoding, Hebei, China;4. China Animal Disease Control Center, China Agriculture Ministry, Beijing, China |