1. 5th Medical Detachment, 168th Multifunctional Medical Detachment, 65th Medical Brigade, Unit # 15247, APO AP 96205-5247, USA.
2. Department of Environmental Medical Biology, Yonsei University College of Medicine, Seoul 120-752, Korea.
3. Viral and Rickettsial Diseases Department, Naval Medical Research Center, Silver Spring, MD 20910-7500, USA.
4. Department of Microbiology, College of Medicine, Korea University, Seoul 136-705, Korea.
5. Virology Division, 1425 Porter Street, U.S. Army Medical Research Institute of Infectious Diseases, Fort Detrick, MD 21702-5011, USA.
6. Force Health Protection and Preventive Medicine, 65th Medical Brigade/USAMEDDAC-Korea, Unit # 15281, APO AP 96205-5281, USA.