1. Infectious Diseases Department, Naval Medical Research Institute, Bethesda, MD 20814-5055 and Department of Immunology, Walter Reed Army Institute of Research, Washington, DC 20307-5100.
2. Department of Immunology, Walter Reed Army Institute of Research, Washington, DC 20307-5100.
3. Infectious Diseases Department, Naval Medical Research Institute, Bethesda, MD 20814-5055.
4. Biomedical Research Institute, Rockville, MD 20852.
5. Primate Center, TNO, Rijswijk, The Netherlands.