Expert Global citimpact: 78.37 Researcher at Department of Epidemiology, Crisis organization and Diagnostics, Central Veterinary Institute (CVI) part of Wageningen UR, P.O. Box 65, 8200 AB Lelystad, The ; Department of Farm Animal Health, Faculty of Veterinary Medicine, Utrecht University, P.O. Box 80, b51, 3508 TD Utrecht, The . Electronic address: .