Affiliation: Laboratory of Parasitology, Graduate School of Infectious Diseases, Faculty of Veterinary Medicine, Hokkaido University, Kita-18, Nishi-9, Sapporo, Hokkaido 060-0818, Japan
Division of Parasitology, Veterinary Research Unit, International Institute for Zoonosis Control, Hokkaido University, Kita-20, Nishi-10, Sapporo, Hokkaido 001-0020, Japan