1. College of Veterinary Medicine, Chonbuk National University, Chonju 561-756
2. College of Veterinary Medicine, Seoul National University, Seoul 135-703
3. National Veterinary Research and Quarantine Service, Anyang 430-016
4. Department of Parasitology, College of Medicine, Wonkwang University, Iksan 570-749, South Korea
5. Northern Branch, Gyeongbuk Veterinary Service Laboratory, Andong 760-749