1. Institute for Veterinary Food Science, Justus Liebig University Giessen, Giessen, Germany
2. Department Biological Safety, German Federal Institute for Risk Assessment, Berlin, Germany
3. Central Facility for Microscopy, Helmholtz Centre for Infection Research GmbH, Braunschweig, Germany
4. Clinic for Poultry, University of Veterinary Medicine Hannover Foundation, Hannover, Germany
5. Institute of Preventive Veterinary Science and Department of Veterinary Medicine, Zhejiang University College of Animal Sciences, Hangzhou, China
6. Hainan Institute of Zhejiang University, Sanya, China