Correspondence:Kiyoshi MakiyaKikuo Matsuo
Department of Medical Zoology, Fujita Health University, School of Health Science, Kutsukakecho, Toyoake, Aichi Prefecture 470-11, Japan.
Kiyoshi Makiya
Department of Parasitology and Tropical Public Health, School of Medicine, University of occupational and Environmental Health, Yahata-nishi-ku, Kitakyushu 807, Japan.