1. Department of Neurology, NYU Medical Center, New York 10016 USA, Laboratory of Clinical Microbiology and Immunology, The Rockefeller University, 1230 York Avenue, New York 10021 USA
2. Laboratory of Clinical Microbiology and Immunology, The Rockefeller University, 1230 York Avenue, New York 10021 USA
3. Advanced Biotechnologies, Columbia, Maryland 21046 USA
4. Department of Neuropathology New York Hospital-Cornell Medical Center NY, New York 10021, USA
5. Department of Virology, University of Helsinki, Finland