1. Center for Molecular and Translational Human Infectious Diseases Research, The Methodist Hospital Research Institute, Houston, Texas 77030
2. Laboratory of Human Bacterial Pathogenesis, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana 59840
3. Novartis Vaccines and Diagnostics, Via Fiorentina 1, 53100 Siena, Italy
4. Department of Pathology, Baylor College of Medicine, One Baylor Plaza, Houston, Texas 77030