1. OIE Reference Laboratory for Gumboro Disease, Avian and Rabbit Virology Immunology and Parasitology Unit (VIPAC), French Agency for Food, Environmental and Occupational Heath Safety (ANSES), Ploufragan, France
2. ENSV, Oued Smar – Alger, Algeria
3. The Pirbright Institute, Surrey, UK
4. Veterinärwissenschaftliches Department, Institut für Tierphysiologie, Ludwig-Maximilians-Universität München, Munich, Germany