1. Tulane National Primate Research Center, Covington, LA;
2. Department of Pathology, University of Pennsylvania, Philadelphia, PA;
3. Yerkes National Primate Research Center, Atlanta, GA;
4. Centre International de Recherches Medicales, Franceville, Gabon;
5. Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD;
6. New England Primate Research Center, Southborough, MA