1. Institute for Veterinary Medical Research, Centre for Agricultural Research, Hungarian Academy of Sciences, Budapest, Hungary
2. Instituto Zooprofilattico Sperimentale delle Venezie, Verona, Italy
3. Institute of Veterinary Science, University of Liverpool, Leahurst Campus, Neston, United Kingdom
4. Faculty of Veterinary and Agricultural Sciences, University of Melbourne, Victoria, Australia
5. MSD Animal Health, Walton Manor, Milton Keynes, Buckinghamshire, United Kingdom
6. Department of Microbiology and Infectious Diseases, University of Veterinary Medicine, Budapest, Hungary