1. Department of Animal Medicine, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Sharkia, 44511, Egypt
2. Department of Veterinary Population Medicine, University of Minnesota, St. Paul, MN, 55108, USA
3. Department of Virology, Animal Health Research Institute, Dokki 12618, Giza, Egypt
4. Veterinary Serum and Vaccine Research Institute, East of Cairo, 131, Egypt
5. Department of Microbiology, Faculty of Pharmacy, Zagazig University, Zagazig, Sharkia, 44519, Egypt