1. Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, People’s Republic of China
2. College of Veterinary Medicine, Shandong Vocational Animal Science and Veterinary College, Weifang, People’s Republic of China
3. Key Laboratory for Experimental Teratology of Ministry of Education and Department of Immunology, School of Basic Medical Science, Shandong University, Jinan, People’s Republic of China
4. Institute of Microbiology, University of Agriculture, Faisalabad, Pakistan