1. Prionics, Wagistrasse 27a 8952 Schlieren-Zurich Switzerland
2. Veterinary Laboratories Agency - Weybridge; Woodham Lane, New Haw Addlestone Surrey KT15 3NB
3. National Animal Disease Center; PO Box 70, 2300 Dayton Road Ames IA 50010 USA
4. Istituto Zooprofilattico dell'Umbria e delle Marche; Via G. Salvemini 1 06126 Perugia Italy
5. Lelystad Biologicals; PO Box 405 8200 AK Lelystad The Netherlands
6. AsureQuality; Private Bag 14 946, Panmure Auckland New Zealand
7. College of Life Sciences and Conway Institute of Biomolecular and Biomedical Research; University College Dublin; Dublin Ireland