1. Laboratory of Environmental Science for Sustainable Development, Department of Veterinary Medical Sciences, The University of Tokyo, Tokyo 113‑8657, Japan
2. School of Veterinary Medicine, Okayama University of Science, Imabari, Ehime 794‑0051, Japan
3. National Institute of Animal Health, Tsukuba, Ibaraki 305‑1002, Japan
4. Division of Infection Control and Disease Prevention, Department of Veterinary Medical Sciences, Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo 113‑8657, Japan
5. Santa Mineral Co., Ltd., Tokyo 105‑0013, Japan
6. Mineral Activation Technical Research Center, Omuta, Fukuoka 836‑0041, Japan