1. János Szentágothai Research Center, University of Pécs, Pécs, Hungary.
2. Institute of Biology, Faculty of Sciences, University of Pécs, Pécs, Hungary.
3. Institute for Veterinary Medical Research, Centre for Agricultural Research, Hungarian Academy of Sciences, Budapest, Hungary.
4. Central Agriculture Office, Budapest, Hungary.
5. Department of Immunology and Biotechnology, Medical School, University of Pécs, Pécs, Hungary.
6. National Centre of Infectious and Parasitic Diseases, Sofia, Bulgaria.
7. Institute Pasteur, Unité de Biologie des Infections Virales Emergentes, Lyon, France.