1. Centre for Infectious Disease Control, National Institute for Public Health and the Environment (RIVM), Bilthoven, the Netherlands
2. Department of Viroscience, Erasmus Medical Center, WHO Collaborating Centre for arbovirus and hemorrhagic fever virus reference and research, Rotterdam, the Netherlands
3. Public health service (GGD) Amsterdam, Amsterdam, the Netherlands
4. OIE and National Collaborating Centre for Reference and Research on Leptospirosis (NRL), Amsterdam, the Netherlands
5. Wageningen Bioveterinary Research, Lelystad, The Netherlands
6. Uppsala University, Uppsala, Sweden
7. Research Laboratory for Vector-Borne Diseases, Queen Astrid Military Hospital, Brussels, Belgium