1 Medical Microbiology, University Medical Center Utrecht, Utrecht, Netherlands.
2 Centre for Infectious Disease Control, National Institute for Public Health and the Environment, Bilthoven 3720 BA, Netherlands. Electronic address: [email protected].
3 Netherlands Reference Laboratory for Bacterial Meningitis, Center of Infection and Immunity Amsterdam, Amsterdam University Medical Center, Amsterdam, Netherlands.
4 Medical Microbiology and Immunology, St Antonius Hospital, Nieuwegein, the Netherlands.
5 Centre for Infectious Disease Control, National Institute for Public Health and the Environment, Bilthoven 3720 BA, Netherlands.