1. Ludwig-Maximilians-Universität Munich, Faculty of Veterinary Medicine, Department of Veterinary Sciences, Munich, Germany
2. Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute of Bacterial Infections and Zoonoses, Jena, Germany
3. Alere Technologies GmbH, Jena, Germany
4. Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute of Epidemiology, Wusterhausen, Germany