1. National Veterinary Institute (SVA); SE-75189 Uppsala Sweden
2. SaBio IREC; National Wildlife Research Institute (CSIC-UCLM-JCCM); Ciudad Real Spain
3. Office National de la Chasse et de la Faune Sauvage; Micropolis F-05000 Gap France
4. Department of Viroscience; Erasmus MC Rotterdam 3015 CN The Netherlands