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Background and Aims
The duration of protection from hepatitis B vaccination in children and adults is not known. In 1981, we used three doses of plasma‐derived hepatitis B vaccine to immunize a cohort of 1578 Alaska Native adults and children from 15 Alaska communities who were ≥6 months old.
Approach and Results
We tested persons for antibody to hepatitis B surface antigen (anti‐HBs) levels 35...