1. Avian Pathology Unit, Institut Agronomique et Vétérinaire Hassan II, BP: 1010, Rabat, 6202 Morocco
2. Industrial Layer Farm Integration of Rhamna 43402, Morocco
3. MENA, Boehringer Ingelheim, Ingelheim am Rhein 55216, Germany
4. Clinic for Poultry and Fish Medicine, Department for Farm Animals and Veterinary Public Health, University of Veterinary Medicine, Vienna 1210, Austria