1. Institute of Virology, Justus-Liebig-University Giessen, Giessen, Germany
2. Clinic for Birds, Reptiles, Amphibians and Fish, Justus-Liebig-University Giessen, Giessen, Germany
3. Institute for Virology, Faculty of Veterinary Medicine, University of Leipzig, Leipzig, Germany
4. Institute of Veterinary Pathology, Justus-Liebig-University Giessen, Giessen, Germany