1. Department of Virology, Croatian Institute of Public Health, 10000 Zagreb, Croatia
2. School of Medicine, University of Zagreb, 10000 Zagreb, Croatia
3. Department of Microbiology and Infectious Diseases with Clinic, Faculty of Veterinary Medicine, University of Zagreb, 10000 Zagreb, Croatia
4. Department of Biology, Josip Juraj Strossmayer University of Osijek, 31000 Osijek, Croatia
5. Poultry Center, Croatian Veterinary Institute, 10000 Zagreb, Croatia
6. Department for Animal Breeding and Livestock Production, Faculty of Veterinary Medicine, University of Zagreb, 10000 Zagreb, Croatia
7. Department of Infectious Diseases, Clinical Hospital Center Osijek, 31000 Osijek, Croatia
8. School of Medicine, Josip Juraj Strossmayer University of Osijek, 31000 Osijek, Croatia
9. Department for the Immunocompromised Patients, University Hospital for Infectious Diseases “Dr. Fran Mihaljevic”, 10000 Zagreb, Croatia
10. Department of Infectious Diseases, General Hospital Varazdin, 42000 Varazdin, Croatia
11. Department of Infectious Diseases, County Hospital Cakovec, 40000 Cakovec, Croatia