1Department of Pathology, College of Verterinary Medicine, Seoul National University, Suwon City 441-744, Korea.
2National Veterinary Research and Quarantine Service, Anyang City 430-016, Korea.
3Department of Parasitology and Catholic Institute of Parasitic Diseases, Catholic University, College of Medicine, Seoul 137-701, Korea. JFIF d d Ducky d qhttp://ns.adobe.com/xap/1.0/