1. Poultry Institute, Chinese Academy of Agricultural Sciences, Yangzhou, People’s Republic of China
2. Jiangsu Co-Innovation Center for the Prevention and Control of Important Animal Infectious Disease and Zoonose, Yangzhou University, Yangzhou, People’s Republic of China
3. Department of Animal Science, The University of Tennessee, Knoxville, TN, USA
4. Department of Pathobiology, Auburn University College of Veterinary Medicine, Auburn, AL, USA