1. VISAVET Health Surveillance Centre; Universidad Complutense; Madrid Spain
2. Departamento de Medicina y Cirugía Animal; Facultad de Veterinaria; Universidad Complutense; Madrid Spain
3. National Institute for Public Health and the Environment (RIVM); Centre for Infectious Disease Control (CIb); Bilthoven The Netherlands
4. Utrecht University; Faculty of Veterinary Medicine; Department of Infectious Diseases and Immunology; Utrecht The Netherlands
5. Centre for Preventive Medicine; Animal Health Trust; Suffolk UK
6. Departamento de Sanidad Animal; Facultad de Veterinaria; Universidad Complutense; Madrid Spain