1. World Organization for Animal Health (OIE), National Reference Laboratory for Salmonella, Istituto Zooprofilattico Sperimentale delle Venezie, Legnaro (Padova), Italy.
2. Department of Infectious, Parasitic, and Immuno-Mediated Diseases, Istituto Superiore di Sanità, Rome, Italy.
3. Department of Veterinary Disease Biology, Faculty of Health and Medical Sciences, University of Copenhagen, Frederiksberg C, Denmark.