1. Institute of Preventive Veterinary Medicine, College of Veterinary Medicine of Sichuan Agricultural University, Chengdu, Sichuan, People’s Republic of China
2. Research Centre of Avian Disease, College of Veterinary Medicine of Sichuan Agricultural University, Chengdu, Sichuan, People’s Republic of China
3. Key Laboratory of Animal Disease and Human Health of Sichuan Province, Chengdu, Sichuan, People’s Republic of China