1. Howard Hughes Medical Institute, University of Alabama at Birmingham, Birmingham, AL 35294
2. Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294
3. Department of Microbiology, University of Alabama at Birmingham, Birmingham, AL 35294
4. Section of Biostatistics, University of Alabama at Birmingham, Birmingham, AL 35294
5. Institut de Recherche pour le Developpement, University of Montpellier, Montpellier Cedex 5, France
6. Department of Pathology, Emory University, Atlanta, GA 30329
7. Department of Laboratory Medicine, Emory University, Atlanta, GA 30329
8. International Health, Emory University, Atlanta, GA 30329
9. Department of Medicine, University of Pennsylvania, Philadelphia, PA 19104
10. Vaccine Research Center, National Institutes of Health, Bethesda, MD 20892
11. Department of Pediatrics, Tulane University Health Sciences Center, New Orleans, LA 70112