1. National Laboratory for Veterinary Quality Control on Poultry Production; Animal Health Research Institute; Dokki, Giza, Egypt
2. The Federal Research Institute for Animal Health; Friedrich Loeffler Institute – Institute of Molecular Biology; Greifswald Insel-Riems, Germany
3. Virology Department; Faculty of Veterinary Medicine; Beni-Suef University; Beni-Suef, Egypt
4. Microbiology Department; Virology Division; College of Medicine; Taif University; Al-Taif, Saudi Arabia