1. Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA.
2. Emory University Vaccine Center, Atlanta, GA 30322, USA.
3. Department of Molecular Genetics and Microbiology, University of Florida, Gainesville, FL 32610, USA.
4. Departments of Pediatrics and Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
5. Center for Computational and Integrative Biology and Gastrointestinal Unit, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114, USA.
6. Departments of Infectious Diseases and Immunology, St. Jude Children’s Research Hospital, Memphis, TN 38105, USA.