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The age specific prevalence of hepatitis B surface antigen and antibody was studied among a random sample of Nauruans over the age of 10 years. Overall, 79% of subjects showed evidence of past infection with hepatitis B virus with the highest prevalence among young people. While there was no difference in the infection rate between males and females, the carrier rate in males was 50% higher. In both sexes the carrier rate declined with increasing age. Significant differences in carrier rates were detected among people living in different parts of the island.
Accepted for publication January 14, 1978.
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