1. Comparative Medicine Branch, Division of Scientific Resources, Centers for Disease Control and Prevention, Atlanta, Georgia; Georgia Gwinnett College, Lawrenceville, Georgia
2. Immunology and Pathogenesis Branch, Influenza Division, Centers for Disease Control and Prevention, Atlanta, Georgia
3. Comparative Medicine Branch, Division of Scientific Resources, Centers for Disease Control and Prevention, Atlanta, Georgia; Department of Veterans Affairs, Atlanta VAMC, Decatur, Georgia