1. Division of Virology, Shimane Prefectural Institute of Public Health and Environmental Science, Japan
2. Institute of Rickettsioses, Kita-Fukushima Medical Center, Japan
3. Shimane Prefectural Institute of Hamada Public Health Center, Japan
4. Division of Bacteriology, Shimane Prefectural Institute of Public Health and Environmental Science, Japan
5. Department of Virology I, National Institute of Infectious Diseases, Japan
6. Department of Health and Welfare, Shimane Prefectural Governmental Office, Japan