1. Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, Tennessee, USA
2. Department of Pediatrics, Vanderbilt University Medical Center, Nashville, Tennessee, USA
3. Elizabeth B. Lamb Center for Pediatric Research, Vanderbilt University Medical Center, Nashville, Tennessee, USA
4. Institut Pasteur, Centre National de la Recherche Scientifique UMR 3569, Paris, France
5. Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins, Colorado, USA