1. US Department of Health and Human Services, Biomedical Advanced Research and Development Authority, Washington, District of Columbia
2. National Institutes of Health, Division of Microbiology and Infectious Diseases, Bethesda, Maryland
3. Divisions of Infectious Diseases, Northwestern University Feinberg School of Medicine, Chicago, Illinois
4. Department of Emergency Medicine, Johns Hopkins Hospital, Johns Hopkins University School of Medicine, Baltimore, Maryland; for the ED Influenza Research Consortium
5. Influenza Division, Centers for Disease Control and Prevention, Atlanta, Georgia
6. Division of Biostatistics, School of Public Health, University of Minnesota, Minneapolis
7. US Food and Drug Administration, Division of Antiviral Products, Silver Spring, Maryland
8. Shady Grove Medical Center, Rockville, Maryland