1. Spiez Laboratory, Swiss Federal Office for Civil Protection, 3700 Spiez, Switzerland
2. ADMED Microbiology, 2300 La Chaux-de-Fonds, Switzerland
3. Food Microbial Systems, Risk Assessment and Mitigation Group, Agroscope, 3097 Bern, Switzerland
4. Institute for Infectious Diseases, University of Bern, 3001 Bern, Switzerland
5. Department of Infectious Diseases, Inselspital, Bern University Hospital, University of Bern, 3010 Bern, Switzerland
6. Institute of Microbiology, University Hospital Center and University of Lausanne, 1005 Lausanne, Switzerland