1. Faculty of Bioscience Engineering; Laboratory of Immunology and animal Biotechnology; Ghent University; Gent Belgium
2. Department of Pathology; Faculty of Veterinary Medicine; Zagazig University; Zagazig Egypt
3. Faculty of Veterinary Medicine; Laboratory of Immunology; Ghent University; Merelbeke Belgium
4. Technology and Food Science Unit; Institute for Agricultural and Fisheries Research (ILVO); Melle Belgium