1. Department of Veterinary Internal Medicine and Clinical Pathology, College of Veterinary Medicine, Chonbuk National University, Jeonju, Jeonbuk 561-756
2. Division of Medical Microbiology, Department of Pathology, The Johns Hopkins Medical Institutions, Baltimore, Maryland 21287
3. Mol-BioNet Research Institute, Scientec Lab Center Co., Ltd., Daeduk-Gu, Taejon 306-030
4. Division of Rickettsial & Zoonotic Diseases, Department of Microbiology, National Institute of Health, Seoul 122-701, Korea