Affiliation: | 1. Department of Bacteriology, National Institute of Infectious Diseases, Toyama 1‐23‐1, Shinjuku‐ku, Tokyo 162‐8640, Japan.;2. Department of Infection Pathology, Graduate School of Medicine, Tokyo University, Hongo 7‐3‐1, Bunkyo‐ku, Tokyo 113‐0033, Japan. |