1. Croatian Institute of Public Health Zagreb Croatia
2. School of Medicine University of Zagreb Zagreb Croatia
3. Croatian Veterinary Institute Zagreb Croatia
4. Clinical Hospital Center Osijek Osijek Croatia
5. Medical Faculty Josip Juraj Stossmayer University of Osijek Osijek Croatia
6. Faculty of Veterinary Medicine University of Zagreb Zagreb Croatia
7. Andrija Stampar Teaching Institute of Public Health Zagreb Croatia
8. University Hospital for Infectious Diseases "Dr Fran Mihaljevic" Zagreb Croatia
9. Faculty of Forestry University of Zagreb Zagreb Croatia
10. General Hospital Varazdin Varazdin Croatia
11. General Hospital "Dr Tomislav Bardek" Koprivnica Croatia
12. County Hospital Cakovec Cakovec Croatia
13. General County Hospital Pozega Pozega Croatia
14. General Hospital "Dr Josip Bencevic" Slavonski Brod Croatia
15. Croatian Veterinary Institute Regional Institute Split Split Croatia
16. OIE Reference Center for West Nile Disease Istituto Zooprofilattico Sperimentale "G. Caporale" Teramo Italy