1. Department of Virology, Croatian National Institute of Public Health, School of Medicine University of Zagreb, Zagreb, Croatia.
2. Microbiology Service, Istria County Institute of Public Health, Pula, Croatia.
3. Zagreb County Institute of Public Health and School of Medicine University of Rijeka, Croatia.
4. Communicable Disease Epidemiology Service, Croatian National Institute of Public Health, Zagreb, Croatia.
5. Department of Bacteriology, Croatian National Institute of Public Health, Zagreb, Croatia.