[1] Electron Microscope Laboratory, Kyoto Prefectural University of Medicine, Kawaramachi-dori, Kamigyo-ku, Kyoto,602, Japan
[2] Department of Microbiology, Kyoto Prefectural University of Medicine, Kawaramachi-dori, Kamigyo-ku, Kyoto,602, Japan
[3] The Maizuru National Hospital, Maizuru, Kyoto,625, Japan