Affiliation: | 1)National Institute of Animal Health, National Agriculture and Food Research Organization, 3–1–5 Kannondai, Tsukuba, Ibaraki 305–0856, Japan;2)Fukui Livestock Hygiene Service Center, 69–10–1 Ohbatake-cho, Fukui, Fukui 918–8226, Japan;3)Central Animal Hygiene Service Center of Tochigi Prefecture, 6–8 Hiraide Kogyo-danchi, Utsunomiya, Tochigi 321–905, Japan |