1. Department of Infectious Diseases, St. Jude Children's Research Hospital, University of Tennessee Health Science Center, Memphis, Tennessee 38105.
2. Department of Pediatrics, University of Tennessee Health Science Center, Memphis, Tennessee 38105.
3. Department of Preventive Medicine, University of Tennessee Health Science Center, Memphis, Tennessee 38105.
4. Children's Hospital of Philadelphia, Department of Pediatrics, The University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104.
5. Department of Biostatistics, Harvard School of Public Health, Boston, Massachusetts 02115.
6. SeraCare BioServices, Gaithersburg, Maryland 20877.
7. Department of Pediatrics, University of California, San Diego, La Jolla, California 92037.
8. Department of Pediatrics, Stroger Hospital of Cook County/CORE Center, Chicago, Illinois 60612.
9. Department of Pediatrics, Tulane University School of Medicine, New Orleans, Louisiana 70112.
10. Department of Pediatrics, University of Southern California, Los Angeles, California 90033.
11. Department of Pediatrics, University of Miami School of Medicine, Miami, Florida 33136.
12. Children's Hospital, National Medical Center, Washington, D.C. 20010.
13. National Institute of Allergy and Infectious Diseases, Rockville, Maryland 20857.
14. Frontier Science and Technology Research Foundations, Inc., Amherst, New York 14226.