1. Center for Vaccines and Immunology, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA
2. Department of Infectious Diseases, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA
3. Emory-UGA Centers of Excellence for Influenza Research and Surveillance (CEIRS), Athens, GA 30602, USA
4. Center for Influenza Disease and Emergence Response (CIDER), Athens, GA 30602, USA