1. State Key Laboratory for Animal Disease Control and Prevention, Harbin Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Harbin, Heilongjiang, China
2. Laboratory Animal Centre, Qiqihar Medical University, Qiqihar, China
3. Institute of Animal Husbandry, Heilongjiang Academy of Agriculture Sciences, Harbin, Heilongjiang, China
4. College of Veterinary Medicine, Northeast Agricultural University, Harbin, Heilongjiang, China
5. Heilongjiang Research Center for Veterinary Biopharmaceutical Technology, Harbin, China
6. Heilongjiang Provincial Key Laboratory of Veterinary Immunology, Harbin, China