1. Department of Virology II, National Institute of Infectious Diseases, Tokyo 208-0011, Japan
2. Department of Genetic Engineering, Kindai University, Wakayama 649-6493, Japan
3. Department of Virology I, National Institute of Infectious Diseases, Tokyo 162-8640, Japan
4. Clinical Research Support Center, Tokyo Metropolitan Komagome Hospital, Tokyo 113-8677, Japan
5. Department of Pathology, National Institute of Infectious Diseases, Tokyo 162-8640, Japan
6. Department of Laboratory Medicine, The Jikei University School of Medicine, Tokyo 105-8461, Japan
7. Department of Infectious Disease Research, Foundation for Biomedical Research and Innovation at Kobe, Kobe 650-0047, Japan
8. Department of Microbiology and Immunology, Hamamatsu University School of Medicine, Hamamatsu 431-3192, Japan
9. Department of Neurology, PML/MS/NMO Center, Tokyo Metropolitan Komagome Hospital, Tokyo 113-8677, Japan
10. Department of Biological Science and Technology, Tokyo University of Science, Tokyo 125-8585, Japan