[1] Alaska Native Tribal Hlth Consortium, Liver Dis & Hepatitis Program, Anchorage, AK 99508 USA
[2] Ctr Dis Control & Prevent, Arctic Invest Program, Div Preparedness & Emerging Infect, Natl Ctr Emerging & Zoonot Infect Dis, Anchorage, AK USA
[3] Univ Washington, Sch Med, Dept Pathol, Seattle, WA 98195 USA
[4] US PHS, Anchorage, AK USA
[5] Southcent Fdn Res Dept, Anchorage, AK USA
[6] Univ Washington, Sch Med, Dept Lab Med, Seattle, WA 98195 USA