1 Department of Pathology and Laboratory Medicine, University of Rochester Medical Center, Rochester, NY, USA.
2 Department of Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN, USA.
3 Immunology and Pathogenesis Branch, Influenza Division, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA, USA.
4 Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, USA.