1. Bacteriology Division, US Army Medical Research Institute of Infectious Diseases, Frederick, MD, USA
2. Pathology Division, US Army Medical Research Institute of Infectious Diseases, Frederick, MD, USA
3. Regulated Research Administration Division, U. S. Army Medical Research Institute of Infectious Diseases (USAMRIID), Frederick, MD, USA
4. Division of Infectious Diseases, Department of Medicine, University of California, Los Angeles, CA, USA