1. Department of Small Ruminants Health; Animal Health Service; PO Box 4 5280 AA Boxtel The Netherlands
2. Department of Ruminants Health; Animal Health Service; PO Box 4 5280 AA Boxtel The Netherlands
3. Department of Pathology; Animal Health Service; PO Box 4 5280 AA Boxtel The Netherlands
4. Institute for Animal Science and Health; (ID-DLO); PO Box 65 8200 AB Lelystad The Netherlands