1. ISP, INRA, Université de Tours, UMR1282; Nouzilly France
2. IHAP, Université de Toulouse, INRA, ENVT; Toulouse France
3. The Roslin Institute, University of Edinburgh; Edinburgh UK
4. Zoetis, External Innovation-Anti-Infectives, VMRD; Kalamazoo MI USA
5. Veterinary Medicine; University of Utrecht; Utrecht The Netherlands
6. Department of Veterinary Medicine and Surgery; University of Missouri; Columbia MO USA