Correspondence: Masao Kamiya
Junko INOHARA
Nariaki NONAKA
Yuzaburo OKU
Masao KAMIYA
Laboratory of Parasitology, Department of Animal Disease Control, Graduate School of Veterinary Medicine, Hokkaido University, Sapporo 060, Japan
Hong Kean OOI
Department of Veterinary Medicine, National chung Hsing Univeristy, Taichung, Taiwan, R.O.C.