1. Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, and Institute of Endemic Diseases, Seoul National University Medical Research Center, Seoul 110-799, Korea.
2. Regional Emerging Infectious Disease Consultant, 18th Medical Command, APO AP 96205-5281,
3. 5th Medical Detachment, 168th Medical Battalion (AS), 18th Medical Command, APO AP 96205-5247,
4. Department of Microbiology, College of Medicine, Korea University, Seoul 136-701, Korea.