1. Clinic for Poultry and Fish Medicine, Department for Farm Animals and Veterinary Public Health, Vetmeduni Vienna, Vienna, Austria
2. Institute for Veterinary Medical Research, Centre for Agricultural Research, Hungarian Academy of Sciences, Budapest, Hungary
3. Institut für Populationsgenetik, Vetmeduni Vienna, Vienna, Austria
4. Christian Doppler Laboratory for Innovative Poultry Vaccines, University of Veterinary Medicine, Vienna, Austria