Giovanni Ghielmetti1,*, Monika Hilbe2, Ute Friedel1, Chiara Menegatti3, Luca Bacciarini3, Roger Stephan1, Guido Bloemberg4

1Institute for Food Safety and Hygiene, Section of Veterinary Bacteriology, University of Zurich, Winterthurerstrasse 270, 8057 Zurich, Switzerland
2Institute of Veterinary Pathology, University of Zurich, Winterthurerstrasse 268, 8057 Zurich, Switzerland
3Cantonal Veterinary Office, Via Dogana 16, 6500 Bellinzona, Switzerland.
4National Reference Center for Enteropathogenic Bacteria and Listeria, Institute for Food Safety and Hygiene, University of Zurich, Winterthurerstrasse 272, 8057 Zurich, Switzerland