1. Arctic Investigations Program, Division of Preparedness and Emerging Infections, National Center for Emerging and Zoonotic Infectious Diseases, Centers for Disease Control and Prevention, Anchorage, Alaska
2. Section of Epidemiology, Division of Public Health, Alaska Department of Health and Social Services, Anchorage, Atlanta, Georgia
3. Respiratory Disease Branch, Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia