1 Division of Neuropathology, Institute for Pathology, Basel University Hospital, Basel, Switzerland.
2 Division of Veterinary Medicine, Institute for Animal and Environmental Hygiene, Center for Infection Medicine, Freie Universität Berlin, Berlin, Germany.
3 Institute for Pathology, University of Berne, Berne, Switzerland.
4 Sektion für Hygiene und Medizinische Mikrobiologie, Medizinische Universität Innsbruck, Innsbruck, Austria.
5 Department of Neuroradiology, Basel University Hospital, Basel, Switzerland.
6 Department of Neurology, Basel University Hospital, Basel, Switzerland.
7 Department of Infectiology, Lucerne Cantonal Hospital, Lucerne, Switzerland.
8 Department of Neurosurgery, Basel University Hospital, Basel, Switzerland.