1. Department of Pathobiology, Faculty of Veterinary & Animal Sciences, Pir Mehr Ali Shah Arid Agriculture University Rawalpindi, Pakistan
2. College of Veterinary Medicine, Nanjing Agricultural University, 1 Weigang, Nanjing, Jiangsu 210095, PR China
3. Department Clinical Sciences, Faculty of Veterinary & Animal Sciences, Pir Mehr Ali Shah Arid Agriculture University Rawalpindi, Pakistan