1. Center for Laboratory Medicine, Veterinary Diagnostic Services, Frohbergstrasse 3, 9001 St. Gallen, Switzerland
2. Clinical Laboratory, Vetsuisse Faculty, Department of Clinical Diagnostics and Services, and Center for Clinical Studies, University of Zurich, Winterthurerstrasse 260, 8057 Zurich, Switzerland
3. Clinic for Equine Internal Medicine, Equine Department, University of Zurich, 8057 Zurich, Switzerland
4. School of Biodiversity, One Health and Veterinary Medicine, College of Medical, Veterinary and Life Sciences, University of Glasgow, Bearsden Road, Glasgow G61 1QH, UK
5. MRC-University of Glasgow, Centre for Virus Research, Bearsden Road, Glasgow G61 1QH, UK
6. Department of Medicine and Epidemiology, School of Veterinary Medicine, University of California, Davis, CA 95616, USA
7. Institute of Diagnostic Virology, Friedrich-Loeffler-Institut (FLI), Suedufer 10, 17493 Greifswald-Insel Riems, Germany