1. Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia
2. Respiratory Diseases Branch, Division of Bacterial Diseases, National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, Georgia
3. Arctic Investigations Program, Division of Preparedness and Emerging Infections, National Center for Zoonotic and Emerging Infectious Diseases, Centers for Disease Control and Prevention, Anchorage, Alaska
4. Johns Hopkins School of Medicine, Baltimore, Maryland
5. Section of Epidemiology, Division of Public Health, Alaska Department of Health and Social Services, Anchorage