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, USA
2. Infectious Disease Programs Branch, Public Health Agency of Canada, Ottawa, ON, Canada
3. National Microbiology Laboratory, Winnipeg, MB, Canada
4. Section of Epidemiology, Division of Public Health, Alaska Department of Health & Social Services, Anchorage, Alaska, USA