1. Swiss Institute of Equine Medicine (ISME) Department of Clinical Veterinary Medicine Vetsuisse Faculty University of Bern, and Agroscope Länggassstrasse 124 Bern 3012 Switzerland
2. Institute for Infectious Diseases University of Bern Friedbühlstrasse 51 Bern 3010 Switzerland
3. Swiss Institute of Equine Medicine (ISME) Department of Clinical Veterinary Medicine Vetsuisse Faculty University of Bern, and Agroscope Les Longs‐Prés Avenches 1580 Switzerland