M. Kamran, *M. U. D. Ahmad, A. A. Anjum, **A. Maqbool, K. Muhammad, M. Nawaz, N.U. Hudda, S. Sana and M. A. Ali
Department of Microbiology, *Department of Epidemiology, **Department of Parasitology, Faculty of Veterinary Sciences, University of Veterinary and Animal Sciences, Lahore