1. Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan.
2. The Shimane Prefectural Institute of Public Health and Environmental Science, Matsue, Shimane, Japan.
3. The Saitama Prefectural Institute of Public Health, Saitama, Japan.
4. Mahara Institute of Medical Acarology, Anan, Tokushima, Japan.
5. University of Fukui, Eiheiji-cho, Fukui, Japan.
6. Chiba Institute of Science, Choshi, Chiba, Japan.
7. Rakuno Gakuen University, Ebetsu, Hokkaido, Japan.
8. Kawasaki City Institute for Public Health, Kawasaki, Kanagawa, Japan.