1. Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland 20205
2. Infectious Diseases Program Center, Naval Medical Research Institute, Bethesda, Maryland 20814-5055
3. Department of Immunology, Walter Reed Army Institute of Research, Washington, D.C. 20307
4. Malaria Branch, Division of Parasitic Diseases, Center for Infectious Diseases, Centers for Disease Control, Atlanta, Georgia 30333
5. Department of Tropical Public Health, Harvard School of Public Health, Boston, Massachusetts 02114