1. Institute for Infectious Diseases, University of Bern, Bern, Switzerland
2. Graduate School for Cellular and Biomedical Sciences, University of Bern, Bern, Switzerland
3. Swiss Tropical and Public Health Institute, Basel, Switzerland
4. Division of Communicable Diseases, Institute for Social and Preventive Medicine, University of Zurich, Zurich, Switzerland
5. Department of Infectious, Parasitic and Immune-Mediated Diseases, Istituto Superiore di Sanità, Rome, Italy
6. Institute of Veterinary Bacteriology, Vetsuisse Faculty, University of Bern, Bern, Switzerland