1. Department of Internal Medecine, Hôpital du Jura, 2800 Délemont, Switzerland
2. Department of Internal Medecine, Hôpital de la Broye, 1530 Payerne, Switzerland
3. Institute of Microbiology, University of Lausanne and University Hospital Center, 1011 Lausanne, Switzerland
4. Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, 3012 Bern, Switzerland
5. Unit of Infectious Diseases, Department of Internal Medicine, HFR-Hôpital cantonal, 1708 Fribourg, Switzerland