1. Department of Immunology, Walter Reed Army Institute of Research, Washington, D.C. 20307
2. Department of Microbiology, Stanford University Medical School, Palo Alto, California 94305
3. Department of Entomology, Walter Reed Army Institute of Research, Washington, D.C. 20307
4. Biomedical Research Institute, Rockville, Maryland 20852
5. Malaria Branch,· Infectious Disease Program Center, Naval Medical Research Institute, Bethesda. Maryland 20014
6. Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases. Bethesda, Maryland 20205
7. Laboratory of Parasitic Diseases, National Institute of Allergy and Infectious Diseases