Affiliation: | 1. College of Veterinary Medicine, China Agricultural University, Haidian District, Beijing 100193, China;2. Department of Veterinary Pathobiology, College of Veterinary Medicine & Biomedical Sciences, Texas A&M University, College Station, Texas 77843-4467, USA;3. Institute of Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China |