1 Division of Neurological Sciences, Department of Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
2 Austrian Agency for Health and Food Safety (AGES) Ltd., Institute for Veterinary Disease Control, Mödling, Austria.
3 Institute of Virology and Immunology, Bern, Switzerland.
4 Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland.
5 Division of Neurological Sciences, Department of Clinical Research and Veterinary Public Health, Vetsuisse Faculty, University of Bern, Bern, Switzerland. torsten.seuberlich@vetsuisse.unibe.ch.