1. Department of Pathology, University of Agriculture, Faisalabad, Pakistan;
2. Key Lab of Animal Epidemiology and Zoonosis of Ministry of Agriculture, College of Veterinary Medicine, Beijing Agricultural University, Beijing, China;
3. University College of Veterinary and Animal Science, The Islamia University of Bahawalpur, Bahawalpur, Pakistan;
4. Shandong Binzhou Animal Science and Veterinary Medicine Academy, Shandong, China