1. Baylor College of Medicine, Houston, TX;
2. Texas Children’s Hospital Center for Human Immunobiology, Houston, TX;
3. Laboratory of Clinical Infectious Diseases, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, MD;
4. Children’s Hospital of Philadelphia Research Institute, Philadelphia, PA;
5. Laboratory of Infectious Diseases, National Institute of Allergy and Infectious Disease, National Institutes of Health, Bethesda, MD;
6. University of Texas Southwestern Medical Center, Dallas, TX;
7. University of Massachusetts Medical School, Worcester, MA; and
8. Division of Biology and Medicine, Brown University, Providence, RI