1. Department of Veterinary Pathology , University of Abuja , Abuja, Nigeria
2. Department of Veterinary Pathology and Microbiology , University of Nigeria , Nsukka, Nigeria
3. Department of Veterinary Pathology , Ahmadu Bello University , Zaria, Nigeria
4. Department of Veterinary Medicine , Ahmadu Bello University , Zaria, Nigeria
5. Department of Veterinary Pathology , University of Jos , Jos, Nigeria