1. Department of Comparative Pathobiology, Purdue Institute for Immunology, Inflammation and Infectious Disease, Purdue University Center for Cancer Research, College of Veterinary Medicine, Purdue University, West Lafayette, IN 47907, USA
2. Department of Pathology and Genomic Medicine, Center for Infectious Diseases and Translational Medicine, Houston Methodist Research Institute, Weill-Cornell Medicine, Houston, TX 77030, USA
3. Influenza Division, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA