1. Laboratory of Veterinary Parasitology, Faculty of Agriculture, Iwate University, Ueda, 3-18-8, Morioka 020-8550, Japan
2. Department of Pathogenetic Veterinary Science, United Graduate School of Veterinary Science, Gifu University, Yanagido 1-1, Gifu 501-1193, Japan
3. Department of Microbiology and Parasitology, Faculty of Animal Science and Veterinary Medicine, Sher-e-Bangla Agricultural University, Dhaka 1207, Bangladesh
4. Faculty of Veterinary Medicine, Mahanakorn University of Technology, 140 Cheum-Sampan Road, Nong Chok, Bangkok 10530, Thailand