1. Department of Fish Diseases, National Veterinary Research Institute, Pulawy, Poland
2. Department of Food and Environmental Virology, National Veterinary Research Institute, Pulawy, Poland
3. Department of Pathology, National Veterinary Research Institute, Pulawy, Poland
4. Department of Infectious Diseases and Immunology, College of Veterinary Medicine, University of Florida, Gainesville, Florida, USA
5. Emerging Pathogens Institute, University of Florida, Gainesville, Florida, USA