1. Department of Microbiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
2. Department of Pathology and Laboratory Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
3. Division of Protective immunity, The Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
4. Department of Pathology, Microbiology, and Immunology, Vanderbilt University School of Medicine, Nashville, Tennessee, USA
5. Department of Medicine, Vanderbilt University School of Medicine, Nashville, Tennessee, USA