1. Institute for Virology and Immunology, University of Würzburg, 97078 Würzburg, Germany
2. Department of Microbiology, Faculty of Medicine, Chiang Mai University, Chiang Mai 50200, Thailand
3. Department of Clinical Microbiology, Faculty of Associated Medical Sciences, Chiang Mai University, Chiang Mai 50200, Thailand
4. Max Planck Institut für Hirnforsching, Neurochemie, 60528 Frankfurt/Main, Germany