1. Ibaraki Prefectural Institute of Public Health, Ibaraki, Japan
2. Gunma Paz University Graduate School of Health Science, Gunma, Japan
3. Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan
4. Division of Nursing Science, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
5. Faculty of Agriculture, Takasaki University of Health and Welfare, Gunma, Japan
6. Department of Molecular Biodefence Research, Yokohama City University Graduate School of Medicine, Kanagawa, Japan
7. Laboratory of Viral Infection I, Kitasato Institute for Life Sciences, Kitasato University, Tokyo, Japan