1. Laboratory for Zoonoses and Environmental Microbiology, National Institute of Public Health and the Environment (RIVM), Bilthoven, the Netherlands
2. Laboratory for Infectious Diseases and Perinatal Screening, National Institute of Public Health and the Environment (RIVM), Bilthoven, the Netherlands
3. Epidemiology and Surveillance Unit at the Centre for Infectious Disease Control Netherlands, National Institute of Public Health and the Environment (RIVM), Bilthoven, the Netherlands