1. Okayama Prefectural Health Center of Environment and Public Health; Uchio Okayama Okayama 701-02
2. Public Health Section; Okayama Prefectural Government; Uchisange Okayama Okayama 700
3. Department of Veterinary Microbiology, Faculty of Agriculture; Tottori University; Koyama-cho Tottori, Tottori 680