1. Department of Environmental Medical Biology, Yonsei University College of Medicine, Seoul 120-752, Korea.
2. 5th Medical Detachment, 168th Multifunctional Medical Battalion, 65th Medical Brigade, Unit 15247, APO AP 96205-5247, USA.
3. Suncheon-si Health Service Center, Suncheon 540-972, Korea.
4. Department of Clinical Pathology, Shinheung College, Uijeongbu 480-701, Korea.
5. National Institute of Biological Resources, Inchoen 404-708, Korea.
6. Force Health Protection and Preventive Medicine, 65th Medical Brigade/US Army MEDDAC-Korea, Unit #15281, APO AP 96205-5281, USA.
7. Division of Medical Entomology, Korea Center for Disease Control and Prevention, National Institute of Health, Seoul 122-701, Korea.