1 Department of Pathology and Laboratory Medicine, University of Wisconsin School of Medicine and Public Heath, University of Wisconsin-Madison, Madison, WI, USA. Electronic address: albailey@wisc.edu.
2 Department of Medicine, Washington University School of Medicine, St. Louis, MO, USA; Department of Molecular Microbiology, Washington University School of Medicine, St. Louis, MO, USA; Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO, USA; The Andrew M. and Jane M. Bursky Center for Human Immunology and Immunotherapy Programs, Washington University School of Medicine, St. Louis, MO, USA. Electronic address: mdiamond@wustl.edu.