1. State Key Laboratory of Veterinary Etiological Biology, Lanzhou Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Lanzhou, China
2. Center for Biomedical Research, Northwest Minzu University, Lanzhou, China
3. Department of Cattle and Sheep Diseases, National Veterinary Research Institute, Pulawy, Poland
4. Laboratory of Serological Diagnosis, National Veterinary Research Institute, Pulawy, Poland
5. Institute of Special Animal and Plant Sciences, Chinese Academy of Agricultural Sciences, Changchun, China