1. Department of Clinical Studies, School of Veterinary Medicine, Shiraz University, P.O. Box 71345-1731, Shiraz, Iran
2. Clinic for Poultry and Fish Medicine, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine Vienna, Veterinaerplatz 1, 1210 Vienna, Austria
3. Christian Doppler Laboratory for Innovative Poultry Vaccines (IPOV), Veterinaerplatz 1, 1210 Vienna, Austria